github: annotate build warnings

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

__tests__/fixtures/lint.Dockerfile

@@ -0,0 +1,28 @@
+# syntax=docker/dockerfile-upstream:master
+
+# Copyright 2024 actions-toolkit authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+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

__tests__/github.test.itg.ts

@@ -249,3 +249,40 @@ maybe('writeBuildSummary', () => {
     });
   });
 });
+
+maybe('annotateBuildWarnings', () => {
+  it('annoate lint issues', async () => {
+    const buildx = new Buildx();
+    const build = new Build({buildx: buildx});
+
+    fs.mkdirSync(tmpDir, {recursive: true});
+    await expect(
+      (async () => {
+        // prettier-ignore
+        const buildCmd = await buildx.getCommand([
+          '--builder', process.env.CTN_BUILDER_NAME ?? 'default',
+          'build',
+          '-f', path.join(fixturesDir, 'lint.Dockerfile'),
+          fixturesDir,
+          '--metadata-file', build.getMetadataFilePath()
+        ]);
+        await Exec.exec(buildCmd.command, buildCmd.args, {
+          env: Object.assign({}, process.env, {
+            BUILDX_METADATA_WARNINGS: 'true'
+          }) as {
+            [key: string]: string;
+          }
+        });
+      })()
+    ).resolves.not.toThrow();
+
+    const metadata = build.resolveMetadata();
+    expect(metadata).toBeDefined();
+    const buildRef = build.resolveRef(metadata);
+    expect(buildRef).toBeDefined();
+    const buildWarnings = build.resolveWarnings(metadata);
+    expect(buildWarnings).toBeDefined();
+
+    await GitHub.annotateBuildWarnings(path.join(fixturesDir, 'lint.Dockerfile'), buildWarnings);
+  });
+});