Add the PHP Compat GitHub Action Workflow

.github/workflows/php-compat.yml

@@ -0,0 +1,45 @@
+name: PHP Compatibility
+
+on:
+  push:
+    branches:
+      - develop
+      - main
+    paths:
+      - "**.php"
+  pull_request:
+    branches:
+      - develop
+    paths:
+      - "**.php"
+
+jobs:
+  php-compatibility:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup proper PHP version
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: 8.3
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+      - name: Cache dependencies
+        uses: actions/cache@v4
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Install dependencies
+        run: composer install --prefer-dist
+
+      - name: Run PHP Compatibility
+        run: ./vendor/bin/phpcs --standard=./phpcs-compat.xml -p -s .

composer.json

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+{
+  "name": "mailchimp/wordpress",
+  "description": "Add a Mailchimp signup form widget to your WordPress site.",
+  "type": "wordpress-plugin",
+  "homepage": "https://github.com/mailchimp/wordpress",
+  "license": "GPL-2.0-or-later",
+  "authors": [
+    {
+      "name": "Mailchimp",
+      "email": "[email protected]"
+    }
+  ],
+  "prefer-stable": true,
+  "require": {
+    "php": ">=7.4"
+  },
+  "require-dev": {
+    "10up/phpcs-composer": "^3.0"
+  },
+  "config": {
+    "allow-plugins": {
+      "dealerdirect/phpcodesniffer-composer-installer": true
+    }
+  }
+}