ci: push proposal 'use' images

.github/workflows/ci.yml

@@ -108,12 +108,26 @@ jobs:
       # Enable corepack for packageManager config
       - run: corepack enable || sudo corepack enable
       - run: yarn install
+      # Set up docker-bake files used by docker/bake-action
+      - run: node_modules/.bin/synthetic-chain prepare-ci
 
-      - name: build proposal images
-        run: |
-          docker info
-          node_modules/.bin/synthetic-chain build
-      # TODO run tests in another (non-matrixed) job once "use" images are available in another worker
+      # Matrix within "bake" instead of GitHub Actions because the actions
+      # won't resolv the DAG of what to build first.
+      - name: Push proposal "use" images
+        uses: docker/bake-action@v4
+        with:
+          files: |
+            ./docker-bake.json
+            ./docker-bake.hcl
+            ${{ steps.meta.outputs.bake-file }}
+          targets: use
+          # FIXME DONOTMERGE change to skip PRs once the PR is approved
+          push: true
+          # Only build on "main" merges because the tags aren't qualified by PR.
+          # If we pushed from PRs, each one would overwrite (e.g. use-upgrade-8)
+          # push: ${{ github.event_name != 'pull_request' }}
+
+        # TODO run tests in another (non-matrixed) job once "use" images are available in another worker
       - name: run proposal tests
         if: ${{ matrix.platform == env.X86_PLATFORM }}
         run: node_modules/.bin/synthetic-chain test

docker-bake.hcl

@@ -1,3 +1,9 @@
+// If you're new to Bake:
+// https://blog.kubesimplify.com/bake-your-container-images-with-bake
+
+// for https://github.com/docker/metadata-action?tab=readme-ov-file#bake-definition
+target "docker-metadata-action" {}
+
 // PROPOSALS variable is filled by docker-bake.json, which this config merges upon
 // https://docs.docker.com/build/bake/reference/#file-format
 
@@ -9,6 +15,7 @@ group "default" {
 }
 
 target "use" {
+  inherits = ["docker-metadata-action"]
   name = "use-${proposal}"
   matrix = {
     proposal = PROPOSALS