Rebuild and redeploy Cloud Build image weekly

[parlough]

Currently the https://github.com/dart-lang/site-shared/tree/main/cloud_build/firebase-ghcli image that we build and upload is only rebuilt if edited. That however results in the image getting out of date. To prevent that from occurring and resulting in certain tools we rely on (Dart) being older than we need, can there be an additional automatic weekly build and upload? Cloud Build seems to have some docs on Scheduling builds.

[parlough]

@khanhnwin or @redbrogdon Would one of you be able to help me with this? Or connect me with someone who can. I'd really appreciate it as our deploy will soon rely on more up-to-date versions of Dart. Thank you!! 🙏

[redbrogdon]

@johnpryan, do you have anything analogous set up for DartPad that we could steal?

[johnpryan]

We use Cloud Scheduler to trigger our Cloud Build step that updates the Docker containers. This cron job runs once per day:

[redbrogdon]

@parlough, I'm guessing you don't access to that, so we'll need to help on our end.

@khanhnwin, IIRC, you set up the Cloud Build config for the website. If so, do you mind joining a meeting with Parker and me to clone what John did?