Try using github actions

Let's see how badly this goes

.github/workflows/ccpp.yml

@@ -0,0 +1,20 @@
+name: Smoke test
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    - name: configure
+      run: |
+        mkdir build && cd build && cmake ..
+    - name: build
+      run: |
+        make -j4
+    - name: test
+      run: | 
+        ctest -V