feat(ci): publish Docker image to Docker Hub and GHCR

Add dual-registry publishing to both Docker Hub (rootfr/jmap-webmail)
and GitHub Container Registry. Multi-arch support for amd64/arm64.

.github/workflows/docker-publish.yml

@@ -20,10 +20,6 @@ on:
     tags: ["v*.*.*"]
   workflow_dispatch:
 
-env:
-  REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}
-
 jobs:
   build-and-push:
     runs-on: ubuntu-latest
@@ -41,10 +37,16 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
       - name: Log in to GHCR
         uses: docker/login-action@v3
         with:
-          registry: ${{ env.REGISTRY }}
+          registry: ghcr.io
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
@@ -52,11 +54,14 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          images: |
+            rootfr/jmap-webmail
+            ghcr.io/${{ github.repository }}
           tags: |
             type=raw,value=latest,enable={{is_default_branch}}
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=
 
       - name: Build and push
         uses: docker/build-push-action@v6

README.md

@@ -132,7 +132,7 @@ 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)
+- Pre-built Docker image on [Docker Hub](https://hub.docker.com/r/rootfr/jmap-webmail) and [GHCR](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
@@ -233,6 +233,9 @@ npm start
 
 ```bash
 # Using the pre-built image (recommended)
+docker run -p 3000:3000 -e JMAP_SERVER_URL=https://mail.example.com rootfr/jmap-webmail:latest
+
+# Or from GHCR
 docker run -p 3000:3000 -e JMAP_SERVER_URL=https://mail.example.com ghcr.io/root-fr/jmap-webmail:latest
 
 # Or with docker compose

ROADMAP.md

@@ -230,7 +230,7 @@ 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] Pre-built Docker image on [Docker Hub](https://hub.docker.com/r/rootfr/jmap-webmail) and [GHCR](https://ghcr.io/root-fr/jmap-webmail) with multi-arch support (amd64/arm64)
 - [x] GitHub Actions CI/CD for automated image publishing on releases
 
 ## Planned Features