feat: set autoupdater to allow prereleases and downgrading if we are not on the latest channel

currently only supports alpha

ts/updater/updater.ts

@@ -118,6 +118,15 @@ async function checkForUpdates(
       return;
     }
 
+    if (releaseChannelFromFsFromRenderer !== 'latest') {
+      // we only allow pre-release updates if the release channel is alpha
+      autoUpdater.allowPrerelease = releaseChannelFromFsFromRenderer === 'alpha';
+      autoUpdater.allowDowngrade = releaseChannelFromFsFromRenderer === 'alpha';
+      logger.info(
+        `[updater] checkForUpdates we are on the ${releaseChannelFromFsFromRenderer} channel allowPrerelease ${autoUpdater.allowPrerelease} allowDowngrade ${autoUpdater.allowDowngrade}`
+      );
+    }
+
     const currentVersion = autoUpdater.currentVersion.toString();
     const isMoreRecent = isVersionGreaterThan(latestVersionFromFsFromRenderer, currentVersion);
     logger.info('[updater] checkForUpdates isMoreRecent', isMoreRecent);