feat: add docker publish workflow

.github/workflows/docker-publish.yml

@@ -0,0 +1,62 @@
+name: Build and 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 repository
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU (for multi-arch builds)
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - 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 Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            # Tag with version on git tags (e.g. v0.7.0 → 0.7.0 and 0.7)
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            # Tag latest only on main branch pushes
+            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}
+            # Tag with short SHA for traceability
+            type=sha,prefix=sha-
+
+      - name: Build and push Docker image
+        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