generate GitHub annotations for build checks

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

.github/workflows/ci.yml

@@ -1463,3 +1463,29 @@ jobs:
           file: ./test/Dockerfile
         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:
+          context: ./test
+          file: ./test/lint.Dockerfile

src/main.ts

@@ -97,7 +97,12 @@ actionsToolkit.run(
 
     let err: Error | undefined;
     await Exec.getExecOutput(buildCmd.command, buildCmd.args, {
-      ignoreReturnCode: true
+      ignoreReturnCode: true,
+      env: Object.assign({}, process.env, {
+        BUILDX_METADATA_WARNINGS: 'true'
+      }) as {
+        [key: string]: string;
+      }
     }).then(res => {
       if (res.stderr.length > 0 && res.exitCode != 0) {
         err = Error(`buildx failed with: ${res.stderr.match(/(.*)\s*$/)?.[0]?.trim() ?? 'unknown error'}`);
@@ -106,7 +111,7 @@ actionsToolkit.run(
 
     const imageID = toolkit.buildxBuild.resolveImageID();
     const metadata = toolkit.buildxBuild.resolveMetadata();
-    const digest = toolkit.buildxBuild.resolveDigest();
+    const digest = toolkit.buildxBuild.resolveDigest(metadata);
     if (imageID) {
       await core.group(`ImageID`, async () => {
         core.info(imageID);
@@ -127,7 +132,7 @@ actionsToolkit.run(
       });
     }
 
-    let ref: string;
+    let ref: string | undefined;
     await core.group(`Reference`, async () => {
       ref = await buildRef(toolkit, startedTime, inputs.builder);
       if (ref) {
@@ -138,6 +143,19 @@ actionsToolkit.run(
       }
     });
 
+    const warnings = toolkit.buildxBuild.resolveWarnings(metadata);
+    if (ref && warnings && warnings.length > 0) {
+      const annotations = await Buildx.convertWarningsToGitHubAnnotations(warnings, [ref]);
+      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.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