First crack at a build workflow

.github/workflows/build.yml

@@ -0,0 +1,16 @@
+name: Build
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Run build
+        run: |
+          ./build