trying pull request event

Author: thefringeninja

.github/workflows/main.yml

@@ -1,17 +1,16 @@
 name: CI
 
-on: [push]
+on: [pull_request]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
-    
     steps:
-    - uses: actions/checkout@v1
-    - name: Run a one-line script
-      run: echo Hello, world!
-    - name: Run a multi-line script
-      run: |
-        echo Add other actions to build,
-        echo test, and deploy your project.
+      - name: filter
+        uses: actions/bin/filter@master
+        with:
+          action: "opened|synchronize|reopened"
+      - name: checkout
+        uses: actions/checkout@master
+      - name: build
+        run: "./build.sh"