generate GitHub annotations for build checks

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

.github/workflows/ci.yml

@@ -641,3 +641,30 @@ jobs:
           targets: app
         env:
           DOCKER_BUILD_RECORD_RETENTION_DAYS: ${{ matrix.days }}
+
+  checks:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        buildx-version:
+          - latest
+          - v0.14.1
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          version: ${{ matrix.buildx-version }}
+          driver-opts: |
+            image=${{ inputs.buildkit-image || env.BUILDKIT_IMAGE }}
+      -
+        name: Build
+        uses: ./
+        with:
+          workdir: ./test
+          files: |
+            ./test/lint.hcl

src/main.ts

@@ -119,7 +119,8 @@ actionsToolkit.run(
     const args: string[] = await context.getArgs(inputs, definition, toolkit);
     const buildCmd = await toolkit.buildx.getCommand(args);
     const buildEnv = Object.assign({}, process.env, {
-      BUILDX_BAKE_GIT_AUTH_TOKEN: gitAuthToken
+      BUILDX_BAKE_GIT_AUTH_TOKEN: gitAuthToken,
+      BUILDX_METADATA_WARNINGS: 'true'
     }) as {
       [key: string]: string;
     };
@@ -164,6 +165,19 @@ actionsToolkit.run(
       }
     });
 
+    const warnings = toolkit.buildxBake.resolveWarnings(metadata);
+    if (refs.length > 0 && warnings && warnings.length > 0) {
+      const annotations = await Buildx.convertWarningsToGitHubAnnotations(warnings, refs);
+      core.debug(`annotations: ${JSON.stringify(annotations, null, 2)}`);
+      if (annotations && annotations.length > 0) {
+        await core.group(`Generating GitHub annotations (${annotations.length} build checks found)`, async () => {
+          for (const annotation of annotations) {
+            core.warning(annotation.message, annotation);
+          }
+        });
+      }
+    }
+
     await core.group(`Check build summary support`, async () => {
       if (!buildSummaryEnabled()) {
         core.info('Build summary disabled');

test/lint-other.Dockerfile

@@ -0,0 +1,10 @@
+frOM busybox as base
+cOpy lint-other.Dockerfile .
+
+froM busybox aS notused
+COPY lint-other.Dockerfile .
+
+from scratch
+COPy --from=base \
+  /lint-other.Dockerfile \
+  /

test/lint.Dockerfile

@@ -0,0 +1,12 @@
+frOM busybox as base
+cOpy lint.Dockerfile .
+
+from scratch
+MAINTAINER moby@example.com
+COPy --from=base \
+  /lint.Dockerfile \
+  /
+
+CMD [ "echo", "Hello, Norway!" ]
+CMD [ "echo", "Hello, Sweden!" ]
+ENTRYPOINT my-program start

test/lint.hcl

@@ -0,0 +1,12 @@
+group "default" {
+  targets = ["lint", "lint-other", "lint-inline"]
+}
+target "lint" {
+  dockerfile = "lint.Dockerfile"
+}
+target "lint-other" {
+  dockerfile = "lint-other.Dockerfile"
+}
+target "lint-inline" {
+  dockerfile-inline = "FRoM alpine\nENTRYPOINT [\"echo\", \"hello\"]"
+}