Add macOS build workflow

Author: Azyyyyyy

.github/workflows/build-macos.yml

@@ -0,0 +1,46 @@
+name: Build-macos
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the $default-branch branch
+  push:
+    branches: [ $default-branch ]
+  pull_request:
+    branches: [ $default-branch ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+      - uses: actions/setup-dotnet@v1
+        with:
+            dotnet-version: '6.0.x' # SDK Version to use; x will use the latest version of the 3.1 channel
+
+      - name: Build x64 and arm64 version for macOS
+        run: dotnet publish .\src\MultiRPC\MultiRPC.csproj -c Release -r osx-x64 && dotnet publish .\src\MultiRPC\MultiRPC.csproj -c Release -r osx-arm64
+
+      - name: Create x64 .app
+        run: cp -r .\macOS Templates\MultiRPC.app .\macOS Templates\MultiRPC-x64.app && cp -r .\src\MultiRPC\bin\Release\net6.0\osx-x64\publish\ .\macOS Templates\MultiRPC-x64.app\Contents\MacOS
+
+      - name: Create arm64 .app
+        run: cp -r .\macOS Templates\MultiRPC.app .\macOS Templates\MultiRPC-arm64.app && cp -r .\src\MultiRPC\bin\Release\net6.0\osx-arm64\publish\ .\macOS Templates\MultiRPC-arm64.app\Contents\MacOS
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: MultiRPC-arm64.app
+          path: .\macOS Templates\MultiRPC-arm64.app
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: MultiRPC-x64.app
+          path: .\macOS Templates\MultiRPC-x64.app