Fix syntax error on caching Github action example

uLan08 · web-flow · commit 6723a79dbcde · 2021-07-20T18:12:48.000+08:00
diff --git a/content/actions/learn-github-actions/migrating-from-gitlab-cicd-to-github-actions.md b/content/actions/learn-github-actions/migrating-from-gitlab-cicd-to-github-actions.md
@@ -343,6 +343,8 @@ test_async:
 ```yaml
 jobs:
   test_async:
+    runs-on: ubuntu-latest
+    steps:
     - name: Cache node modules
       uses: actions/cache@v2
       with:
