chore(ci): switch to GitHub actions

.github/workflows/CI.yaml

@@ -0,0 +1,27 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install dependencies
+        uses: php-actions/composer@v6
+        with:
+          php_version: 8.0
+          version: 2
+
+      - name: PHPUnit Tests
+        uses: php-actions/phpunit@v2
+#        env:
+#          TEST_NAME: Scarlett
+        with:
+          php_version: 8.0
+          version: 9
+          bootstrap: vendor/autoload.php
+          configuration: phpunit.xml.dist
+          args: --coverage-text

.gitignore

@@ -2,3 +2,4 @@ vendor/
 build/
 .idea/
 .php_cs.cache
+composer.lock