Make MacOS great again (#3178)

* Make MacOS great again

* Update cmake.yml

.github/workflows/cmake.yml

@@ -8,7 +8,7 @@ env:
   BUILD_TYPE: RelWithDebInfo
 
 jobs:
-  build:
+  Ubuntu:
     runs-on: ubuntu-latest
 
     steps:
@@ -60,3 +60,28 @@ jobs:
 #      with:
 #        path: ./build_artifact.7z
 #        name: build_artifact.7z
+
+  MacOS:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Install Building Dependancies
+      run: CI/before_install.osx.sh
+
+    - name: Prime ccache
+      uses: hendrikmuhs/ccache-action@v1
+      with:
+        key: ${{ matrix.os }}-${{ env.BUILD_TYPE }}
+        max-size: 1000M
+
+    - name: Configure
+      run: |
+        rm -fr build  # remove the build directory
+        CI/before_script.osx.sh
+
+    - name: Build
+      run: |
+        cd build 
+        make -j $(sysctl -n hw.logicalcpu) package