chore(ci): setup Gitea Actions + Portainer auto-deploy pipeline

.gitea/workflows/deploy.yml

@@ -1,7 +1,48 @@
-# Deployment wird von Portainer erledigt (nicht Gitea Actions).
-# Portainer Stack zeigt auf dieses Repo und baut bei Push automatisch neu.
-# Siehe docker-compose.portainer.yml für Details.
-#
-# Dieses File ist leer damit keine pending Jobs mehr entstehen.
-name: disabled
-on: workflow_dispatch
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches:
+      - main
+      - master
+  workflow_dispatch:
+
+env:
+  REGISTRY: git.purepixel.ch
+  IMAGE: git.purepixel.ch/adminpepe/lageplan
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE }}
+          tags: |
+            type=raw,value=latest
+            type=sha,prefix=,suffix=,format=short
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max