Github Actions CI on push

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: php-actions/composer@v5
+
+      - name: PHPUnit Tests
+        uses: php-actions/phpunit@v6
+        with:
+          bootstrap: tests/bootstrap.php
+          php_version: 7.4
+          php_extensions: json
+          configuration: phpunit.xml
+          args: --coverage-text