Run phpunit tests in CI

.github/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "*.*"
+      - master
+
+jobs:
+  tests:
+    runs-on: ubuntu-20.04
+    strategy:
+      fail-fast: false
+      matrix:
+        php-version:
+          - '8.1'
+        symfony-version:
+          - '5.4.*'
+        coverage: [ 'none' ]
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          tools: flex
+          php-version: "${{ matrix.php-version }}"
+          coverage: "${{ matrix.coverage }}"
+
+      - name: "Install dependencies"
+        uses: ramsey/composer-install@v2
+        env:
+          SYMFONY_REQUIRE: "${{ matrix.symfony-version }}"
+
+      - name: "Run tests"
+        run: make phpunit
+        env:
+          PHP_IMAGE_TAG: "${{ matrix.php-version }}"