Create main.yml

Author: luin

.github/workflows/main.yml

@@ -0,0 +1,10 @@
+name: CI
+on:
+  - push
+  - pull_request
+jobs:
+  test:
+    runs-on: macos-11
+    steps:
+      - uses: actions/checkout@v2
+      - run: swift test