Add GitHub Actions workflow for desktop release builds

Builds macOS (arm64 + x86_64), Windows, and Linux installers via
tauri-action. Triggers on version tags (v*) to create a draft GitHub
Release with all platform installers attached. Also supports manual
workflow_dispatch for testing (uploads as workflow artifacts only).

Author: amoghbanta

.github/workflows/release.yml

@@ -0,0 +1,63 @@
+name: Release Desktop App
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: macos-latest # arm64 (Apple Silicon)
+          - platform: macos-13 # x86_64 (Intel)
+          - platform: windows-latest
+          - platform: ubuntu-22.04
+
+    runs-on: ${{ matrix.platform }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: apps/desktop/src-tauri -> target
+
+      - name: Install Linux dependencies
+        if: matrix.platform == 'ubuntu-22.04'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
+
+      - run: pnpm install --frozen-lockfile
+
+      # Build TypeScript workspace packages (needed before sidecar bundling)
+      - run: pnpm build
+
+      # tauri-action runs beforeBuildCommand (studio build + sidecar compile),
+      # then `tauri build` to produce the installer.
+      - uses: tauri-apps/tauri-action@v0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          projectPath: apps/desktop
+          tagName: ${{ github.ref_type == 'tag' && github.ref_name || '' }}
+          releaseName: "ADT Studio ${{ github.ref_name }}"
+          releaseBody: "Download the installer for your platform below."
+          releaseDraft: true
+          prerelease: false