Cache brew install and build volk from source like SDR++

.github/workflows/macos.yml

@@ -7,6 +7,7 @@ on:
 
 env:
   BUILD_TYPE: Release
+  OSX_TARGET: "10.15"
 
 jobs:
   skip_check:
@@ -34,18 +35,35 @@ jobs:
     - uses: actions/checkout@v3
       with: 
         submodules: recursive 
+
+    - name: Cache brew packages
+      id: cache-homebrew-packages
+      uses: actions/cache@v3
+      env:
+        cache-name: homebrew-packages
+      with:
+        path: $(brew --prefix)
+        key: ${{ env.cache-name }}-${{ hashFiles('.config/brew/Brewfile') }}
 
     - name: Update brew
       run: brew update
 
     - name: Install dependencies 
-      run: brew install pkg-config fftw glfw zstd volk ninja
+      run: brew install pkg-config fftw glfw zstd cmake ninja
 
     - name: Install python mako
       run: pip3 install mako
 
+    - name: Install volk from vendor/volk to pkgconfig
+      run: |
+        cd vendor/volk 
+        cmake . -B build -DCMAKE_OSX_DEPLOYMENT_TARGET=${{env.OSX_TARGET}} -DCMAKE_BUILD_TYPE=Release
+        cmake --build build --config ${{env.BUILD_TYPE}}
+        sudo cmake --build build --config ${{env.BUILD_TYPE}} --target install 
+        cd ..
+
     - name: Configure CMake
-      run: cmake . -B ${{github.workspace}}/build-macos -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -G Ninja
+      run: cmake . -B ${{github.workspace}}/build-macos -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -G Ninja -DCMAKE_OSX_DEPLOYMENT_TARGET=${{env.OSX_TARGET}}
 
     - name: Build
       run: cmake --build ${{github.workspace}}/build-macos --config ${{env.BUILD_TYPE}} --target dab_plugin