Add github workflow

.github/workflows/build_and_test.yml

@@ -0,0 +1,39 @@
+name: Build and test
+on: [push]
+jobs:
+  run_tests:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        php: ["7.2", "7.3", "7.4", "8.0", "8.1.0"]
+        env: ["^3", "^4", "^5", "^6"]
+        exclude:
+          - php: "7.2"
+            env: "^6"
+          - php: "7.3"
+            env: "^6"
+          - php: "7.4"
+            env: "^6"
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Cache Composer packages
+        id: composer-cache
+        uses: actions/cache@v2
+        with:
+          path: vendor
+          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-php-
+
+      - name: Require dependencies
+        run: COMPOSER_MEMORY_LIMIT=-1 composer require symfony/console:${{matrix.env}} symfony/framework-bundle:${{matrix.env}} symfony/http-kernel:${{matrix.env}} --prefer-source
+
+      - name: Install dependencies
+        run: COMPOSER_MEMORY_LIMIT=-1 composer install --prefer-source
+
+      - name: run tests
+        run: XDEBUG_MODE=coverage ./bin/phpunit --coverage-text