Add Electron build workflow

Author: MarkJamesHoward

.github/workflows/electron-build.yml

@@ -0,0 +1,54 @@
+name: Electron Build
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "electron/**"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, macos-latest, ubuntu-latest]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: "npm"
+          cache-dependency-path: electron/package-lock.json
+
+      - name: Install dependencies
+        working-directory: electron
+        run: npm ci
+
+      - name: Build installers
+        working-directory: electron
+        run: npm run dist
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: electron-${{ matrix.os }}
+          path: |
+            electron/dist/*.exe
+            electron/dist/*.msi
+            electron/dist/*.dmg
+            electron/dist/*.pkg
+            electron/dist/*.zip
+            electron/dist/*.AppImage
+            electron/dist/*.deb
+            electron/dist/*.rpm
+            electron/dist/*.tar.gz
+            electron/dist/latest*.yml
+            electron/dist/*.blockmap
+          if-no-files-found: warn