add Forgejo Actions CI/CD workflow

.forgejo/workflows/build-and-deploy.yaml

@@ -0,0 +1,31 @@
+name: Build and Deploy
+
+on:
+  push:
+    branches:
+      - main
+      - dev
+      - 'feat/**'
+      - 'test/**'
+      - 'fix/**'
+      - 'hotfix/**'
+
+env:
+  IMAGE: git.avisenna-engineering.de/keyvan/avisenna-landing-page
+  VERSION: latest
+  NAMESPACE: ${{ github.ref == 'refs/heads/main' && 'prod' || 'web' }}
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Build Docker image
+        run: docker build -t $IMAGE:$VERSION .
+
+      - name: Deploy to Kubernetes
+        run: |
+          kubectl set image deployment/homepage homepage=$IMAGE:$VERSION -n $NAMESPACE
+          kubectl rollout restart deployment/homepage -n $NAMESPACE