Set up GitHub Actions

.github/workflows/macos.yml

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+name: CI
+
+on:
+  push:
+    branches: 
+      - master
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [macOS-latest]
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: "Install Dependencies"
+      run: >
+        brew install --cask dotnet-sdk
+        brew install nodejs
+        npm install -g appdmg
+    - name: "Build Project"
+      run: ./Distribution/build-macos.sh
+    - name: "Create Disk Image"
+      run: appdmg ./Distribution/app-dmg-spec.json ./FRESHMusicPlayer.dmg
+    - uses: actions/upload-artifact@v1
+      name: "Upload Artifact"
+      with:
+        name: "FRESHMusicPlayer.dmg"
+        path: "./FRESHMusicPlayer.dmg"

Distribution/app-dmg-spec.json

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+{
+    "title": "FRESHMusicPlayer",
+    "background": "app-dmg-background.png",
+    "icon-size": 48,
+    "window": {
+        "size": {
+            "width": 600,
+            "height": 420
+        }
+    },
+    "contents": [
+        {
+            "x": 125,
+            "y": 225,
+            "type": "file",
+            "path": "FRESHMusicPlayer.app"
+        },
+        {
+            "x": 470,
+            "y": 225,
+            "type": "link",
+            "path": "/Applications"
+        }
+    ]
+}