feat: publish migrator image

.github/workflows/docker-publish.yml

@@ -76,6 +76,20 @@ jobs:
             type=semver,pattern={{major}}
             type=raw,value=latest,enable={{is_default_branch}}
 
+      # Extract metadata for migrate image
+      - name: Extract Docker metadata for migrate
+        id: meta-migrate
+        uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-migrate
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=raw,value=latest,enable={{is_default_branch}}
+
       # Extract version from git tag or ref
       # Uses git describe to get latest tag + commit hash in SemVer format: 1.2.3+abc1234
       - name: Extract version
@@ -129,6 +143,24 @@ jobs:
           cache-from: type=gha
           cache-to: type=gha,mode=max
 
+      # Build and push migrate Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push migrate Docker image
+        id: build-and-push-migrate
+        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
+        with:
+          context: .
+          file: apps/web/Dockerfile
+          target: migrate
+          push: ${{ github.event_name != 'pull_request' }}
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta-migrate.outputs.tags }}
+          labels: ${{ steps.meta-migrate.outputs.labels }}
+          build-args: |
+            APP_VERSION=${{ steps.version.outputs.version }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
       # Sign the resulting Docker image digest except on PRs.
       # This will only write to the public Rekor transparency log when the Docker
       # repository is public to avoid leaking data.  If you would like to publish
@@ -143,3 +175,11 @@ jobs:
         # This step uses the identity token to provision an ephemeral certificate
         # against the sigstore community Fulcio instance.
         run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
+
+      # Sign the migrate Docker image digest except on PRs.
+      - name: Sign the published migrate Docker image
+        if: ${{ github.event_name != 'pull_request' }}
+        env:
+          TAGS: ${{ steps.meta-migrate.outputs.tags }}
+          DIGEST: ${{ steps.build-and-push-migrate.outputs.digest }}
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}