Add CI for testing and code review standards

.distignore

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+# Exclude directories from WP.org
+.git
+.github
+.wordpress-org
+node_modules
+vendor
+tests
+
+# Exclude files from WP.org
+.distignore
+.editorconfig
+.eslintignore
+.eslint.json
+.gitattributes
+.gitignore
+.markdownlint.json
+.markdownlintignore
+.stylelintignore
+.stylelintrc.json
+composer.json
+composer.lock
+package-lock.json
+package.json
+phpcompat.xml
+phpcs.xml
+phpmd.xml
+phpstan.neon
+README.md

.editorconfig

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+# This file is for unifying the coding style for different editors and IDEs
+# editorconfig.org
+
+# WordPress Coding Standards
+# https://make.wordpress.org/core/handbook/coding-standards/
+
+root = true
+
+[*]
+charset = utf-8
+indent_style = tab
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.yml]
+indent_style = space
+indent_size = 2
+
+[*.txt]
+end_of_line = crlf

.eslintignore

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+*.min.js
+/assets/lib/
+/node_modules/
+/vendor/

.eslintrc.json

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+{
+	"extends": [
+		"plugin:@wordpress/eslint-plugin/es5"
+	],
+	"globals": {
+		"jQuery": true,
+		"console": true
+	},
+	"rules": {
+		"no-console": "off"
+	}
+}

.gitattributes

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+# Exclude directories from export
+/.github/              export-ignore
+/.wordpress-org/       export-ignore
+/node_modules/         export-ignore
+/vendor/               export-ignore
+/tests/                export-ignore
+
+# Exclude files from export
+/.distignore           export-ignore
+/.editorconfig         export-ignore
+/.eslintignore         export-ignore
+/.eslint.json          export-ignore
+/.gitattributes        export-ignore
+/.gitignore            export-ignore
+/.markdownlint.json    export-ignore
+/.markdownlintignore   export-ignore
+/.stylelintignore      export-ignore
+/.stylelintrc.json     export-ignore
+/composer.json         export-ignore
+/composer.lock         export-ignore
+/package-lock.json     export-ignore
+/package.json          export-ignore
+/phpcompat.xml         export-ignore
+/phpcs.xml             export-ignore
+/phpmd.xml             export-ignore
+/phpstan.neon          export-ignore
+/README.md             export-ignore

.github/dependabot.yml

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+# Dependabot set up for three package managers: GitHub Actions, npm and Composer.
+# Documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+
+  # Maintain dependencies for GitHub Actions.
+  - package-ecosystem: "github-actions"
+    # Files stored in repository root.
+    directory: "/"
+    schedule:
+      # Check for updates every weekday.
+      interval: "daily"
+    open-pull-requests-limit: 10
+
+  # Maintain dependencies for npm.
+  - package-ecosystem: "npm"
+    # Files stored in repository root.
+    directory: "/"
+    schedule:
+      # Check for updates every weekday.
+      interval: "daily"
+    open-pull-requests-limit: 10
+
+  # Maintain dependencies for Composer.
+  - package-ecosystem: "composer"
+    # Files stored in repository root.
+    directory: "/"
+    schedule:
+      # Check for updates every weekday.
+      interval: "daily"
+    open-pull-requests-limit: 10

.github/workflows/coding-standards.yml

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+name: Coding Standards
+
+on:
+  push:
+    branches: [ master, dev ]
+  pull_request:
+    branches: [ master, dev ]
+    paths:
+      # Any change to a PHP, JavaScript, CSS/SCSS or Markdown file should run checks.
+      - '**.js'
+      - '**.php'
+      - '**.*css'
+      - '**.md'
+      # These files configure NPM. Changes could affect the outcome.
+      - 'package*.json'
+      # These files configure Composer. Changes could affect the outcome.
+      - 'composer.*'
+      # This file configures ESLint. Changes could affect the outcome.
+      - '.eslintrc.json'
+      # This file configures Stylelint. Changes could affect the outcome.
+      - '.stylelintrc.json'
+      # This file configures Markdownlint. Changes could affect the outcome.
+      - '.markdownlint.json'
+      # This file configures PHPCS. Changes could affect the outcome.
+      - 'phpcs.xml'
+      # Changes to workflow files should always verify all workflows are successful.
+      - '.github/workflows/*.yml'
+  # Allows you to run this workflow manually from the Actions tab.
+  workflow_dispatch:
+
+jobs:
+  # Runs PHP coding standards checks.
+  #
+  # Violations are reported inline with annotations.
+  #
+  # Performs the following steps:
+  # - Checks out the repository.
+  # - Sets up PHP.
+  # - Logs debug information.
+  # - Installs Composer dependencies (use cache if possible).
+  # - Make Composer packages available globally.
+  # - Logs PHP_CodeSniffer debug information.
+  # - Runs PHPCS on the full codebase.
+  phpcs:
+    name: PHP coding standards
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/[email protected]
+
+      - name: Set up PHP
+        uses: shivammathur/[email protected]
+        with:
+          php-version: '7.4' # Results are the same across all versions, check only in the last stable version.
+          coverage: none
+          tools: cs2pr
+        env:
+          fail-fast: false
+
+      - name: Log debug information
+        run: |
+          php --version
+          composer --version
+
+      - name: Check syntax error in sources
+        run: find -L . -path ./vendor -prune -o -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Install Composer dependencies
+        uses: ramsey/composer-install@v1
+
+      - name: Make Composer packages available globally
+        run: echo "${PWD}/vendor/bin" >> $GITHUB_PATH
+
+      - name: Log PHPCS debug information
+        run: composer phpcs-i
+
+      - name: Run the PHP code sniffer
+        continue-on-error: true
+        run: phpcs --report-full --report-checkstyle=./phpcs-report.xml
+
+      - name: Show PHPCS results in PR
+        run: cs2pr ./phpcs-report.xml
+
+  # Runs the JavaScript, CSS/SCSS and Markdown coding standards checks.
+  #
+  # JS and CSS violations are not currently reported inline with annotations.
+  #
+  # Performs the following steps:
+  # - Checks out the repository.
+  # - Installs NodeJS 16 with caching for NPM.
+  # - Logs updated debug information.
+  # _ Installs NPM dependencies using install-changed to hash the `package.json` file.
+  # - Run the WordPress ESLint, Stylelint and Markdownlint checks.
+  js-css-md-cs:
+    name: JS, CSS/SCSS and MD coding standards
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/[email protected]
+
+      - name: Setup Node
+        uses: actions/[email protected]
+        with:
+          node-version: 16
+          cache: npm
+
+      - name: Log debug information
+        run: |
+          npm --version
+          node --version
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Run JavaScript Lint
+        run: npm run lint:js
+
+      - name: Run CSS/SCSS Lint
+        run: npm run lint:css
+
+      - name: Run Markdown Lint
+        run: npm run lint:md:docs

.github/workflows/php-compatibility.yml

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+name: PHP Compatibility
+
+on:
+  push:
+    branches: [ master, dev ]
+  pull_request:
+    branches: [ master, dev ]
+    paths:
+      # Any change to a PHP file should run checks.
+      - '**.php'
+      # These files configure Composer. Changes could affect the outcome.
+      - 'composer.*'
+      # This file configures PHP Compatibility. Changes could affect the outcome.
+      - 'phpcompat.xml'
+      # Changes to workflow files should always verify all workflows are successful.
+      - '.github/workflows/*.yml'
+  # Allows you to run this workflow manually from the Actions tab.
+  workflow_dispatch:
+
+jobs:
+  # Runs PHP compatibility check.
+  #
+  # Violations are reported inline with annotations.
+  #
+  # Performs the following steps:
+  # - Checks out the repository.
+  # - Sets up PHP.
+  # - Logs debug information about the runner container.
+  # - Installs Composer dependencies (use cache if possible).
+  # - Logs PHP_CodeSniffer debug information.
+  # - Runs the PHP compatibility tests.
+  php-compatibility:
+    name: Check PHP compatibility
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/[email protected]
+
+      - name: Set up PHP
+        uses: shivammathur/[email protected]
+        with:
+          php-version: '7.4' # Results are the same across all versions, check only in the last stable version.
+          coverage: none
+        env:
+          fail-fast: false
+
+      - name: Log debug information
+        run: |
+          php --version
+          composer --version
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Install Composer dependencies
+        uses: ramsey/composer-install@v1
+
+      - name: Log PHPCS debug information
+        run: composer phpcs-i
+
+      - name: Run PHP compatibility tests
+        run: composer compat:php

.github/workflows/static-analysis.yml

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+name: Static Analysis
+
+on:
+  push:
+    branches: [ master, dev ]
+  pull_request:
+    branches: [ master, dev ]
+    paths:
+      # Any change to a PHP file should run checks.
+      - '**.php'
+      # These files configure Composer. Changes could affect the outcome.
+      - 'composer.*'
+      # This file configures PHPStan. Changes could affect the outcome.
+      - 'phpstan.neon'
+      # Changes to workflow files should always verify all workflows are successful.
+      - '.github/workflows/*.yml'
+  # Allows you to run this workflow manually from the Actions tab.
+  workflow_dispatch:
+
+jobs:
+  # Runs PHPStan Static Analysis.
+  #
+  # Violations are reported inline with annotations.
+  #
+  # Performs the following steps:
+  # - Checks out the repository.
+  # - Sets up PHP.
+  # - Logs debug information.
+  # - Installs Composer dependencies (use cache if possible).
+  # - Make Composer packages available globally.
+  # - Runs PHPStan on the full codebase.
+  phpstan:
+    name: Static Analysis (PHP ${{ matrix.php-versions }})
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1'] # 5.6 and 7.0 not supported by PHPStan, 7.1 not supported by a PHPMD dependency.
+
+    steps:
+      - name: Checkout repository
+        uses: actions/[email protected]
+
+      - name: Set up PHP
+        uses: shivammathur/[email protected]
+        with:
+          php-version: ${{ matrix.php-versions }}
+          coverage: none
+          tools: cs2pr, phpstan
+        env:
+          fail-fast: false
+
+      - name: Log debug information
+        run: |
+          php --version
+          composer --version
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Install Composer dependencies
+        uses: ramsey/composer-install@v1
+
+      - name: Make Composer packages available globally
+        run: echo "${PWD}/vendor/bin" >> $GITHUB_PATH
+
+      - name: Run PHPStan static analysis (PHP ${{ matrix.php-versions }})
+        run: phpstan analyse -c phpstan.neon --error-format=checkstyle --memory-limit=1G | cs2pr