feat(ci): add GitHub Actions workflow for Docker builds

- Add automated Docker image building on push to main/docker branches
- Publish images to GitHub Container Registry (ghcr.io)
- Support multi-platform builds (linux/amd64, linux/arm64)
- Implement semantic versioning tags
- Add build caching for faster builds
- Update README with pre-built image usage instructions
- Add CI/CD to completed roadmap items

.github/workflows/docker-build.yml

@@ -0,0 +1,68 @@
+name: Docker Build and Push
+
+on:
+  push:
+    branches:
+      - main
+      - docker
+    tags:
+      - "v*"
+  pull_request:
+    branches:
+      - main
+  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 repository
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha,prefix={{branch}}-
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          platforms: linux/amd64,linux/arm64
+
+      - name: Image digest
+        run: echo ${{ steps.meta.outputs.digest }}

README.md

@@ -94,6 +94,20 @@ docker build -t tuxmate:latest .
 docker run -p 3000:3000 tuxmate:latest
 ```
 
+### Using Pre-built Images
+
+Pre-built Docker images are automatically published to GitHub Container Registry:
+
+```bash
+# Pull and run the latest image
+docker pull ghcr.io/abusoww/tuxmate:latest
+docker run -p 3000:3000 ghcr.io/abusoww/tuxmate:latest
+
+# Or use a specific version
+docker pull ghcr.io/abusoww/tuxmate:v1.0.0
+docker run -p 3000:3000 ghcr.io/abusoww/tuxmate:v1.0.0
+```
+
 ### Using Docker Compose (Recommended)
 
 ```bash
@@ -157,6 +171,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md) for contribution guidelines.
 - [x] Package availability indicators
 - [x] Custom domain
 - [x] Docker support for containerized deployment
+- [x] CI/CD workflow for automated Docker builds
 
 ### Planned