feat: add GHCR Docker image publishing with multi-arch support

Add GitHub Actions workflow to automatically build and publish Docker
images to ghcr.io on releases. Supports amd64 and arm64 architectures.
Pre-built image available at ghcr.io/root-fr/jmap-webmail.

.github/workflows/docker-publish.yml

@@ -0,0 +1,56 @@
+name: Publish Docker Image
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*.*.*"]
+  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: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - 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,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

@@ -6,6 +6,14 @@ COPY . .
 RUN npx next build --webpack
 
 FROM node:24-alpine AS runner
+
+LABEL org.opencontainers.image.title="JMAP Webmail"
+LABEL org.opencontainers.image.description="Modern webmail client built with Next.js and the JMAP protocol"
+LABEL org.opencontainers.image.source="https://github.com/root-fr/jmap-webmail"
+LABEL org.opencontainers.image.url="https://github.com/root-fr/jmap-webmail"
+LABEL org.opencontainers.image.licenses="MIT"
+LABEL org.opencontainers.image.vendor="root.cloud"
+
 WORKDIR /app
 ENV NODE_ENV=production
 RUN addgroup --system --gid 1001 nodejs && \

README.md

@@ -122,6 +122,7 @@ This webmail client is designed to work seamlessly with [**Stalwart Mail Server*
 - Persistent language preference
 
 ### Deployment
+- Pre-built Docker image on [GitHub Container Registry](https://ghcr.io/root-fr/jmap-webmail) (amd64/arm64)
 - Docker support with multi-stage build and standalone output
 - Runtime environment variables (no rebuild needed for config changes)
 - Health check endpoint for container orchestration
@@ -198,12 +199,15 @@ npm start
 ### Docker
 
 ```bash
+# Using the pre-built image (recommended)
+docker run -p 3000:3000 -e JMAP_SERVER_URL=https://mail.example.com ghcr.io/root-fr/jmap-webmail:latest
+
 # Using docker-compose
 cp .env.example .env.local
 # Edit .env.local with your JMAP_SERVER_URL
 docker compose up -d
 
-# Or build manually
+# Or build from source
 docker build -t jmap-webmail .
 docker run -p 3000:3000 -e JMAP_SERVER_URL=https://mail.example.com jmap-webmail
 ```

ROADMAP.md

@@ -217,6 +217,8 @@ This document tracks the development status and planned features for JMAP Webmai
 - [x] Health check endpoint
 - [x] Docker support (multi-stage build, docker-compose, standalone output)
 - [x] Structured server-side logger (text/JSON format, configurable level)
+- [x] Pre-built Docker image on GitHub Container Registry (ghcr.io) with multi-arch support (amd64/arm64)
+- [x] GitHub Actions CI/CD for automated image publishing on releases
 
 ## Planned Features