ci: publish Docker image to ghcr.io on release, use pre-built image in docker-compose

- Add docker-publish.yml workflow: builds and pushes to ghcr.io/mes-open/openmes on tag push
- Tags: semver (0.12.0), major.minor (0.12), latest
- docker-compose.yml: image pulls from ghcr.io by default, falls back to local build
- Set OPENMES_VERSION env var to pin a specific version

Author: jakubprzepiora-cyber

.github/workflows/docker-publish.yml

@@ -0,0 +1,60 @@
+name: Build & Publish Docker Image
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Image tag (e.g. v0.12.0 or latest)'
+        required: false
+        default: 'latest'
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository_owner }}/openmes
+
+jobs:
+  build-and-push:
+    name: Build & Push
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        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=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=raw,value=${{ github.event.inputs.tag }},enable=${{ github.event_name == 'workflow_dispatch' }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: backend/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

docker-compose.yml

@@ -21,6 +21,7 @@ services:
       - openmmes-network
 
   backend:
+    image: ghcr.io/mes-open/openmes:${OPENMES_VERSION:-latest}
     build:
       context: .
       dockerfile: backend/Dockerfile
@@ -56,6 +57,7 @@ services:
   # Set MQTT_CONNECTION_ID to the ID from the admin panel.
   # Example: MQTT_CONNECTION_ID=1 docker compose up -d mqtt-listener
   mqtt-listener:
+    image: ghcr.io/mes-open/openmes:${OPENMES_VERSION:-latest}
     build:
       context: .
       dockerfile: backend/Dockerfile