Merge pull request #676 from TomHarte/BuildWorkflow

Adds continuous integration via GitHub actions.

.github/workflows/ccpp.yml

@@ -0,0 +1,22 @@
+name: SDL/Ubuntu
+
+on:
+  push:
+    branches: 
+      - master
+
+  pull_request:
+    branches: 
+      - master
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install dependencies
+      run: sudo apt-get install libsdl2-dev scons
+    - name: Make
+      run: cd OSBindings/SDL; scons