Create GitHub Action to build and push Docker image (#2)

* Create GitHub Action to build and push Docker image

.github/workflows/docker-image.yml

@@ -0,0 +1,66 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches:
+      - "**"
+    tags:
+      - "*"
+  pull_request:
+    branches:
+      - "main"
+
+jobs:
+  buildx:
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            ghcr.io/sourcegraph/bridge-repo-converter
+          # generate Docker tags based on the following events/attributes
+          tags: |
+            type=semver,pattern={{raw}}
+            type=ref,event=branch,prefix={{branch}}-
+            type=ref,event=pr
+            type=ref,event=tag
+            type=raw,value=insiders,enable=${{ github.ref == format('refs/heads/{0}', 'master') }}
+            type=raw,value=insiders-$(date +%Y-%m-%d--%H-%M-%S),enable=${{ github.ref == format('refs/heads/{0}', 'master') }}
+            type=sha,prefix=
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          buildkitd-flags: --debug
+
+      - name: Login to GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: bridge-repo-converter/build
+          platforms: linux/amd64
+          file: bridge-repo-converter/build/Dockerfile
+          push: true
+          sbom: true
+          tags: |
+            ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Inspect
+        run: |
+          docker image inspect ghcr.io/sourcegraph/bridge-repo-converter:{{sha}}