Create tests.yml

.github/workflows/tests.yml

@@ -0,0 +1,17 @@
+name: C tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: run tests
+      run: ./make.sh test run