Add continues integration workflow

Author: jaapio

.github/workflows/continues-integration.yml

@@ -0,0 +1,68 @@
+name: "Continuous Integration"
+
+on:
+  workflow_call:
+    inputs:
+      php-versions:
+        description: "The PHP versions to use when running the job"
+        default: '["7.4", "8.0", "8.1"]'
+        required: false
+        type: "string"
+      php-extensions:
+        description: "The php extensions to install, allowing composer to pass"
+        default: "none, ctype, dom, json, mbstring, phar, simplexml, tokenizer, xml, xmlwriter, fileinfo"
+        required: false
+        type: "string"
+      composer-root-version:
+        description: "The version of the package being tested, in case of circular dependencies."
+        required: false
+        type: "string"
+      composer-options:
+        description: "Additional flags for the composer install command."
+        default: "--prefer-dist"
+        required: false
+        type: "string"
+      test-suite:
+        description: "Test suite to run"
+        default: "unit"
+        required: false
+        type: "string"
+
+jobs:
+  tests:
+    name: "Tests"
+
+    runs-on: "ubuntu-latest"
+
+    strategy:
+      matrix:
+        php-version: "${{ fromJson(inputs.php-versions) }}"
+        dependencies:
+          - "lowest"
+          - "locked"
+          - "highest"
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v3"
+
+      - name: "Set up PHP"
+        uses: "shivammathur/setup-php@2.18.0"
+        with:
+          coverage: "none"
+          extensions: "${{ inputs.php-extensions }}"
+          php-version: "${{ matrix.php-version }}"
+
+      - name: "Set COMPOSER_ROOT_VERSION"
+        run: |
+          echo "COMPOSER_ROOT_VERSION=${{ inputs.composer-root-version }}" >> $GITHUB_ENV
+        if: "${{ inputs.composer-root-version }}"
+
+      - name: "Install dependencies with Composer"
+        uses: "ramsey/composer-install@v1"
+        with:
+          dependency-versions: "${{ inputs.composer-dependencies }}"
+          composer-options: "${{ inputs.composer-options }}"
+
+      - name: "Run tests with phpunit/phpunit"
+        run: "vendor/bin/phpunit --colors=always --testsuite=${{ inputs.test-suite }}"