Add test workflow

.github/workflows/php.yml

@@ -0,0 +1,43 @@
+name: PHP Composer
+
+on:
+    push:
+        branches: [ "master" ]
+    pull_request:
+        branches: [ "master" ]
+
+permissions:
+    contents: read
+
+jobs:
+    build:
+
+        runs-on: ubuntu-latest
+
+        steps:
+            -   uses: actions/checkout@v4
+
+            -   name: Validate composer.json and composer.lock
+                run: docker compose run composer validate --strict
+
+            -   name: Cache Composer packages
+                id: composer-cache
+                uses: actions/cache@v3
+                with:
+                    path: vendor
+                    key: ${{ runner.os }}-php-${{ hashFiles('**/composer.json') }}-${{ github.ref_name }}
+                    restore-keys: |
+                        ${{ runner.os }}-php-${{ hashFiles('**/composer.json') }}
+                        ${{ runner.os }}-php-
+
+            -   name: Install packages
+                run: docker compose run composer install
+
+            -   name: Run test suite
+                run: docker compose run phpspec
+
+            -   name: Run static analyzer
+                run: docker compose run phpstan
+
+            -   name: Run code style checker
+                run: docker compose run php-cs-fixer --dry-run

composer.json

@@ -36,6 +36,8 @@
   },
   "scripts": {
     "test": "vendor/bin/phpspec run",
+    "static-analyzer": "vendor/bin/phpstan",
+    "check-style": "vendor/bin/php-cs-fixer fix --dry-run",
     "fix-style": "vendor/bin/php-cs-fixer fix"
   },
   "repositories": [