Add portable Windows desktop downloads and release uploads

desktop/package.json

@@ -0,0 +1,39 @@
+{
+  "name": "minegeo-desktop",
+  "version": "1.0.0",
+  "private": true,
+  "description": "MineGeo desktop client",
+  "author": "MineGeo",
+  "main": "main.cjs",
+  "scripts": {
+    "start": "electron .",
+    "build": "node prepare-icon.mjs && electron-builder --win portable --x64"
+  },
+  "devDependencies": {
+    "electron": "44.7.0",
+    "electron-builder": "26.15.3"
+  },
+  "build": {
+    "appId": "app.minegeo.desktop",
+    "productName": "MineGeo",
+    "asar": true,
+    "directories": {
+      "output": "dist",
+      "buildResources": "assets"
+    },
+    "files": [
+      "main.cjs",
+      "navigation.cjs",
+      "assets/icon.png",
+      "assets/icon.ico"
+    ],
+    "win": {
+      "target": "portable",
+      "icon": "assets/icon.ico"
+    },
+    "portable": {
+      "artifactName": "MineGeo-${version}-windows-x64.exe",
+      "requestExecutionLevel": "user"
+    }
+  }
+}