Add Super-Linter

Signed-off-by: Tilo Spannagel <development@tilosp.de>

.github/workflows/linter.yml

@@ -0,0 +1,23 @@
+name: Lint Code Base
+
+on:
+  pull_request:
+  push:
+
+jobs:
+
+  build:
+    name: Lint Code Base
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Lint Code Base
+        uses: github/super-linter@v3
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          VALIDATE_BASH: true
+          VALIDATE_DOCKERFILE: true
+          VALIDATE_DOCKERFILE_HADOLINT: true
+          VALIDATE_ENV: true
+          VALIDATE_PHP_BUILTIN: true
+          VALIDATE_YAML: true