Refactor electron launcher

Don't try auto-update on portable builds

src/autoUpdater.ts

@@ -0,0 +1,26 @@
+import { autoUpdater } from 'electron-updater'
+import { BuildInfo } from 'electron-telemetry/build/Model'
+import { UpdateInfo } from '../events'
+import { updateNotifier } from '../backend/src/index'
+
+export function shouldUpdate(build: BuildInfo) {
+  return build.package !== 'portable'
+}
+
+export function handleAutoUpdate() {
+  autoUpdater.on('update-available', (info: UpdateInfo) => {
+    console.log('There is an update available')
+  })
+
+  autoUpdater.on('error', () => {
+    console.log('could not update due to error')
+  })
+
+  updateNotifier.onCheckUpdateRequest.subscribe(() => {
+    try {
+      autoUpdater.checkForUpdatesAndNotify()
+    } catch (error) {
+      console.error(error)
+    }
+  })
+}