ci: add Windows build workflow and include in releases

- Add build-windows.yml for Windows x86_64 builds
- Produces MSI and NSIS exe installers
- Update release.yml to include Windows in release artifacts
- Update release notes to mention Windows downloads

Addresses community requests for Windows builds (winfunc#301, winfunc#332, winfunc#370)

Author: jms830

.github/workflows/build-windows.yml

@@ -0,0 +1,65 @@
+name: Build Windows
+
+on:
+  workflow_call:
+  workflow_dispatch:
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    name: Build Windows x86_64
+    runs-on: windows-latest
+    
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: x86_64-pc-windows-msvc
+      
+      - name: Setup Rust cache
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: src-tauri
+      
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+      
+      - name: Install dependencies
+        run: bun install
+      
+      - name: Build Tauri app
+        run: bun run tauri build --target x86_64-pc-windows-msvc
+      
+      - name: Create artifacts directory
+        shell: pwsh
+        run: |
+          New-Item -ItemType Directory -Force -Path dist/windows-x86_64
+          
+          # Copy MSI installer
+          $msiFiles = Get-ChildItem -Path "src-tauri/target/x86_64-pc-windows-msvc/release/bundle/msi/*.msi" -ErrorAction SilentlyContinue
+          if ($msiFiles) {
+            Copy-Item $msiFiles.FullName -Destination "dist/windows-x86_64/"
+          }
+          
+          # Copy NSIS installer
+          $nsisFiles = Get-ChildItem -Path "src-tauri/target/x86_64-pc-windows-msvc/release/bundle/nsis/*.exe" -ErrorAction SilentlyContinue
+          if ($nsisFiles) {
+            Copy-Item $nsisFiles.FullName -Destination "dist/windows-x86_64/"
+          }
+          
+          # Generate checksums
+          Set-Location dist/windows-x86_64
+          Get-ChildItem -File | ForEach-Object {
+            $hash = (Get-FileHash $_.Name -Algorithm SHA256).Hash.ToLower()
+            "$hash  $($_.Name)" | Out-File -Append -FilePath checksums.txt -Encoding utf8
+          }
+      
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: windows-x86_64
+          path: dist/windows-x86_64/*
+          if-no-files-found: error

.github/workflows/release.yml

@@ -24,11 +24,14 @@ jobs:
     uses: ./.github/workflows/build-macos.yml
     secrets: inherit
 
+  build-windows:
+    uses: ./.github/workflows/build-windows.yml
+    secrets: inherit
 
   # Create release after all builds complete
   create-release:
     name: Create Release
-    needs: [build-linux, build-macos]
+    needs: [build-linux, build-macos, build-windows]
     runs-on: ubuntu-latest
 
     steps:
@@ -66,6 +69,12 @@ jobs:
             cp artifacts/macos-universal/opcode.app.zip release-assets/opcode_${{ steps.version.outputs.version }}_macos_universal.app.tar.gz || true
           fi
           
+          # Windows artifacts
+          if [ -d "artifacts/windows-x86_64" ]; then
+            cp artifacts/windows-x86_64/*.msi release-assets/opcode_${{ steps.version.outputs.version }}_windows_x86_64.msi || true
+            cp artifacts/windows-x86_64/*.exe release-assets/opcode_${{ steps.version.outputs.version }}_windows_x86_64_setup.exe || true
+          fi
+          
           # Create source code archives
           # Clean version without 'v' prefix for archive names
           CLEAN_VERSION="${{ steps.version.outputs.version }}"
@@ -112,9 +121,11 @@ jobs:
 
             - macOS: `.dmg`, `.app.tar.gz` (Universal: Apple Silicon + Intel)
             - Linux: `.AppImage`, `.deb`
+            - Windows: `.msi`, `.exe` installer
 
             ### Installation
 
             - macOS: Open the `.dmg` and drag opcode to Applications.
             - Linux: `chmod +x` the `.AppImage` and run it, or install the `.deb` on Debian/Ubuntu.
+            - Windows: Run the `.msi` or `.exe` installer.