Use Github Actions for tests (#2823)

* Use Github Actions for tests
* gh actions php versions >= 7.1
* github action: +phpcs, -phpunit coverage, -travis cfg
* Simplify composer setup

.github/workflows/test.yml

@@ -0,0 +1,44 @@
+name: "Run unit tests"
+
+on:
+  - push
+  - pull_request
+
+env:
+  COMPOSER_MEMORY_LIMIT: -1
+
+jobs:
+  test:
+    name: "Build"
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 12
+      matrix:
+        php: ['7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
+        package-release: [dist]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Setup PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: exif,json,mbstring,dom
+
+      - name: Install composer dependencies
+        uses: ramsey/composer-install@v2
+        with:
+          dependency-versions: ${{ matrix.package-release }}
+
+      - name: Run unit tests
+        run: vendor/bin/phpunit
+
+      - name: Run code sniffer
+        run: vendor/bin/phpcs --standard=phpcs.xml src tests
+
+      # - name: Upload to Scrutinizer
+      #   continue-on-error: true
+      #   run: |
+      #     wget https://scrutinizer-ci.com/ocular.phar
+      #     php ocular.phar code-coverage:upload --format=php-clover coverage.clover