Merge pull request awslabs#31 from awslabs/github-actions

Use github actions for OSX

Author: Justin Boswell

.github/workflows/mac-osx-ci.yml

@@ -0,0 +1,21 @@
+name: CI
+
+on: [push]
+
+jobs:
+  OSX:
+
+    runs-on: macOS-10.14
+
+    steps:
+    - name: Checkout Source
+      uses: actions/checkout@v1
+    
+    - name: Install Dependencies
+      run: |
+        brew install llvm
+        export PATH=$(brew --prefix llvm)/bin:$PATH
+    
+    - name: Build and test
+      run: |
+        ./codebuild/common-posix.sh -DCMAKE_EXPORT_COMPILE_COMMANDS=ON