Add GitHub Actions CI/CD for GHCR image publishing

- Docker image auto-builds on push to master
- Published to ghcr.io/itsdnns/fritzbox-docsis-monitor:latest
- docker-compose.yml uses image with build fallback
- deploy.sh added locally (gitignored) for NAS deployment

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: itsDNNS

.github/workflows/docker.yml

@@ -0,0 +1,45 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [master]
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Log in to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=latest
+            type=sha,prefix=
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.gitignore

@@ -5,3 +5,4 @@ __pycache__/
 *.pyc
 .vscode/
 .idea/
+deploy.sh

docker-compose.yml

@@ -1,5 +1,6 @@
 services:
   fritzbox-docsis-monitor:
+    image: ghcr.io/itsdnns/fritzbox-docsis-monitor:latest
     build: .
     container_name: fritzbox-docsis-monitor
     restart: unless-stopped