feat: add GitHub Actions workflows for code quality and automation (#2)

php-tests/README.md

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+# ivuorinen/actions/php-tests
+
+## PHP Tests
+
+### Description
+
+Run PHPUnit tests on the repository
+
+### Runs
+
+This action is a `composite` action.
+
+### Usage
+
+```yaml
+- uses: ivuorinen/actions/php-tests@main
+```

php-tests/action.yml

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+---
+# yaml-language-server: $schema=https://json.schemastore.org/github-action.json
+name: PHP Tests
+description: Run PHPUnit tests on the repository
+author: Ismo Vuorinen
+
+branding:
+  icon: check-circle
+  color: green
+
+runs:
+  using: composite
+  steps:
+    - name: Set Git Config
+      uses: ivuorinen/actions/set-git-config@main
+
+    - name: Composer Install
+      uses: ivuorinen/actions/php-composer@main
+
+    - name: Run PHPUnit Tests
+      shell: bash
+      run: vendor/bin/phpunit --verbose