Build + test with github actions

Author: tari

.github/workflows/ci.yml

@@ -0,0 +1,13 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: make
+    - name: Test
+      run: make check