Add macOS/Linux build targets and update CI for all platforms

package.json

@@ -7,8 +7,10 @@
   "scripts": {
     "start": "electron .",
     "dev": "electron . --dev",
-    "build": "electron-builder --win",
-    "build:portable": "electron-builder --win portable"
+    "build:win": "electron-builder --win",
+    "build:mac": "electron-builder --mac",
+    "build:linux": "electron-builder --linux",
+    "build:all": "electron-builder --win --mac --linux"
   },
   "build": {
     "appId": "com.helix.git",
@@ -24,13 +26,26 @@
     ],
     "win": {
       "target": [
-        {
-          "target": "nsis",
-          "arch": ["x64"]
-        }
+        { "target": "nsis", "arch": ["x64"] },
+        { "target": "portable", "arch": ["x64"] }
       ],
       "icon": null
     },
+    "mac": {
+      "target": [
+        { "target": "dmg", "arch": ["x64", "arm64"] }
+      ],
+      "category": "public.app-category.developer-tools",
+      "icon": null
+    },
+    "linux": {
+      "target": [
+        { "target": "AppImage", "arch": ["x64"] },
+        { "target": "deb", "arch": ["x64"] }
+      ],
+      "category": "Development",
+      "icon": null
+    },
     "nsis": {
       "oneClick": false,
       "perMachine": false,