add CI workflow

Author: Gummibeer

.github/workflows/run-tests.yml

@@ -0,0 +1,37 @@
+name: run-tests
+
+on:
+  push:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        php: [8.0, 7.4]
+        dependency-version: [prefer-lowest, prefer-stable]
+
+    name: P${{ matrix.php }} - L${{ matrix.laravel }} - ${{ matrix.dependency-version }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: dom, curl, libxml, mbstring, zip
+
+      - uses: actions/cache@v2
+        with:
+          path: ~/.composer/cache/files
+          key: dependencies-php-${{ matrix.php }}-composer-${{ hashFiles('composer.json') }}
+          restore-keys: |
+            dependencies-php-${{ matrix.php }}-composer-
+            dependencies-php-
+
+      - run: composer update --${{ matrix.dependency-version }} --prefer-dist --no-interaction --no-suggest
+
+      - run: vendor/bin/phpunit