Throw error message instead of exit code

.github/workflows/ci.yml

@@ -56,7 +56,27 @@ jobs:
         if: always()
         uses: crazy-max/ghaction-dump-context@v1
 
-  error:
+  error-msg:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Build
+        continue-on-error: true
+        uses: ./
+        with:
+          files: |
+            ./test/config.hcl
+          set: |
+            *.platform=linux/amd64,linux/ppc64le,linux/s390x
+      -
+        name: Dump context
+        if: always()
+        uses: crazy-max/ghaction-dump-context@v1
+
+  error-check:
     runs-on: ubuntu-latest
     steps:
       -

src/exec.ts

@@ -7,7 +7,7 @@ export interface ExecResult {
   stderr: string;
 }
 
-export const exec = async (command: string, args: string[] = [], silent: boolean): Promise<ExecResult> => {
+export const exec = async (command: string, args: string[] = [], silent?: boolean): Promise<ExecResult> => {
   let stdout: string = '';
   let stderr: string = '';
 

src/main.ts

@@ -1,5 +1,6 @@
 import * as buildx from './buildx';
 import * as context from './context';
+import * as mexec from './exec';
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
 
@@ -25,8 +26,13 @@ async function run(): Promise<void> {
     await exec.exec('docker', [...args, '--print']);
     core.endGroup();
 
-    core.info(`Building...`);
-    await exec.exec('docker', args);
+    await core.group(`Building`, async () => {
+      await mexec.exec('docker', args).then(res => {
+        if (res.stderr.length > 0 && !res.success) {
+          core.error(`buildx bake failed with: ${res.stderr.match(/(.*)\s*$/)![0]}`);
+        }
+      });
+    });
   } catch (error) {
     core.setFailed(error.message);
   }