[migrate] to new workflow syntax

.github/workflows/example.yml

@@ -0,0 +1,13 @@
+name: Quickstart
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - uses: icepuma/rust-action@master
+        with:
+          args: cd integration-test && cargo fmt -- --check && cargo clippy -- -Dwarnings && cargo test