diff --git a/.github/workflows/step1workflow.yml b/.github/workflows/step1workflow.yml
index 38110ac..6f33217 100644
--- a/.github/workflows/step1workflow.yml
+++ b/.github/workflows/step1workflow.yml
@@ -1,5 +1,12 @@
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
 jobs:
   example-job:
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v2