Adds CI workflow

Author: mattd-mb

.github/workflows/ci-workflow.yaml

@@ -0,0 +1,9 @@
+---
+name: CI
+on: [push, pull_request, workflow_dispatch]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: ./.github/actions/ci-action