Switched to macOS to bypass grpc installation on ubuntu

.github/workflows/code-scanning.yml

@@ -7,17 +7,23 @@ on:
   #schedule:
   #  - cron: '0 1 * * 0'
 
+env:
+  MACOS_BREW_PACKAGES: "pkg-config libomp"
+
 jobs:
   CodeQL-Build:
-    runs-on: ubuntu-20.04
+    # Run on macOS only for ease of grpc installation for now
+    runs-on: macos-10-15
 
     steps:
       - name: Checkout repository and install submodules
         uses: actions/checkout@v2
         with:
           submodules: recursive
 
-      # Initialize the CodeQL tools for scanning.
+      - name: Install Dependencies
+        run: brew install ${MACOS_BREW_PACKAGES}
+
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v1
         with:
@@ -27,6 +33,5 @@ jobs:
       - name: Autobuild
         uses: github/codeql-action/autobuild@v1
 
-      # Analyze the code.
       - name: Perform CodeQL Analysis
         uses: github/codeql-action/analyze@v1