ci(wpmc S6): Gitea Actions workflow for PHPUnit on push/PR

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/test.yml

@@ -0,0 +1,34 @@
+name: tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  phpunit:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup PHP 8.0
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.0'
+          coverage: none
+          tools: composer:v2
+
+      - name: Cache Composer dependencies
+        uses: actions/cache@v4
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php8.0-${{ hashFiles('composer.json') }}
+          restore-keys: |
+            ${{ runner.os }}-php8.0-
+
+      - name: Install dependencies
+        run: composer install --no-progress --prefer-dist --no-interaction
+
+      - name: Run PHPUnit
+        run: vendor/bin/phpunit