feat: workflow to run tests on PRs and push to master

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+name: test
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build
+        run: cargo build
+      - name: Run tests
+        run: cargo test