Enable MacOS build

Small corrections
Enable CI releases

.github/workflows/release_build.yml

@@ -11,16 +11,16 @@ jobs:
 
     strategy:
       matrix:
-        os: [windows-latest]
+        os: [windows-latest, macos-latest]
 
     steps:
       - name: Check out Git repository
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
 
       - name: Install Node.js, NPM and Yarn
         uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 14
 
       - name: Build/release Electron app
         uses: samuelmeuli/action-electron-builder@v1