run tests when PR opened

Author: dannysauer

.github/workflows/test.yml

@@ -0,0 +1,15 @@
+---
+name: "test"
+
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request: {}
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: make test