ci: build docker image on main commits

Signed-off-by: Xe Iaso <xe@tigrisdata.com>

Author: Xe

.github/workflows/publish.yml

@@ -0,0 +1,41 @@
+name: Publish container image
+
+on:
+  push:
+    branches: ["main"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU (multi-arch)
+        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: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push with Bake
+        uses: docker/bake-action@v6
+        with:
+          files: |
+            ./docker-bake.hcl
+          # Uses the default group in docker-bake.hcl which targets "www" (push=true)
+          targets: default
+          set: |
+            *.cache-from=type=gha
+            *.cache-to=type=gha,mode=max