Add basic github workflows

.github/actions/pytest-plugins-environment/action.yml

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+name: "pytest-plugin-environment"
+description: "This action sets up an environment for testing and building pytest plugins"
+
+
+inputs:
+
+  python-version:
+    description: 'Python version to use'
+    required: true
+    default: 3.9
+
+  poetry-version:
+    description: 'Poetry version to use'
+    required: true
+    default: 1.7.1
+
+  pipx-version:
+    description: 'Pipx version to use'
+    required: true
+    default: 1.0.0
+
+  ruff-version:
+    description: 'Ruff version to use'
+    required: true
+    default: 0.2.1
+
+  just-version:
+    description: 'Just version to use'
+    required: true
+    default: 1.16.0
+
+runs:
+
+  using: "composite"
+  steps:
+
+    - name: Setup Python (${{ inputs.python-version}})
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ inputs.python-version }}
+
+    - name: Setup Poetry (${{ inputs.poetry-version }})
+      uses: abatilo/actions-poetry@v2
+      with:
+        poetry-version: ${{ inputs.poetry-version }}
+
+    - name: Setup pipx (${{ inputs.pipx-version }})
+      run: pip install "pipx==${{ inputs.pipx-version }}"
+      shell: bash
+
+    - name: Setup ruff (${{ inputs.ruff-version }})
+      run: pipx install "ruff==${{ inputs.ruff-version }}"
+      shell: bash
+
+    - name: Setup just (${{ inputs.just-version }})
+      uses: extractions/setup-just@v1
+      with:
+        just-version: ${{ inputs.just-version }} 
+

.github/workflows/ci-main.yml

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+name: Continues Integration (Master)
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - mainj
+  schedule:
+  # “At 00:00 on every 7th day-of-month from 1 through 31.” (https://crontab.guru)
+    - cron: "0 0 1/7 * *"
+
+jobs:
+
+  CI:
+    uses: ./.github/workflows/ci.yml

.github/workflows/ci-pr.yml

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+name: Continues Integration (PR)
+
+on:
+  pull_request:
+
+jobs:
+
+  CI:
+    uses: ./.github/workflows/ci.yml

.github/workflows/ci.yml

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+name: CI
+
+on:
+  workflow_call:
+    secrets:
+      ALTERNATIVE_GITHUB_TOKEN:
+        required: false
+
+jobs:
+
+  Verify:
+    name: Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: SCM Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Development Environment
+        uses: ./.github/actions/pytest-plugins-environment
+
+      - name: Run Tests of all plugins
+        run: just test
+