Set process.resourcesPath to quiet electron-updater during Linux tests

[philrz]

Since the merge of #3084, I've noticed that in the "Zui CI" Actions workflow on the Ubuntu runner there's warnings in the yarn test step, such as those in this recent run:

PASS apps/zui/src/electron/start.test.ts
  ● Console

    console.warn
      Unable to detect 'package-type' for autoUpdater (beta rpm/deb support). If you'd like to expand support, please consider contributing to electron-builder The "path" argument must be of type string. Received undefined

       7 | import pkg from "src/electron/pkg"
       8 |
    >  9 | autoUpdater.autoDownload = false
         |            ^
      10 | autoUpdater.autoInstallOnAppQuit = false
      11 | autoUpdater.forceDevUpdateConfig = true
      12 |

      at doLoadAutoUpdater (../../node_modules/electron-updater/src/main.ts:52:15)
      at Object.get [as autoUpdater] (../../node_modules/electron-updater/src/main.ts:64:28)
      at Object.<anonymous> (src/domain/updates/linux-updater.ts:9:12)
      at Object.<anonymous> (src/domain/updates/updater.ts:2:45)
      at Object.<anonymous> (src/domain/updates/operations.ts:2:34)
      at Object.<anonymous> (src/initializers/auto-update.ts:5:52)
      at Object.<anonymous> (src/initializers/index.ts:1:23)
      at Object.<anonymous> (src/electron/run-main/run-initializers.ts:3:25)
      at Object.<anonymous> (src/electron/run-main/boot.ts:4:51)
      at Object.<anonymous> (src/electron/run-main/run-main.ts:4:28)
      at Object.<anonymous> (src/electron/start.test.ts:5:41)

I dug into this and found the root cause to be this line from the "beta" support for Linux auto-update added in electron-userland/electron-builder#7060. It looks for this package-type file that normally appears in a location like /opt/Zui/resources/package-type when running a packaged version of the app, but the process.resourcesPath that's used to build that path has been undefined when running our Jest tests. Just the act of importing autoUpdater and making those config settings shown above is enough to trigger this code that looks for the package-type file, hence why it it lands in the catch block and prints the warning.

A clean fix might be to make electron-updater smarter about bailing early when process.resourcesPath is undefined. However, I had challenges when trying to test with a modified electron-updater in a fork repo, so @jameskerr suggested we just make it happy by supplying this dummy value so electron-updater will bail cleanly when it finds the path does not exist on the next line.

[jameskerr]

Thanks looks great