Support cron scheduling via GCP Cloud Scheduler

[MohamedBeydoun]

Summary

For: #20

Added GCP Cloud Scheduler support for cron job scheduling. I followed the linked issue and @ceritium's PR while also adding basic ActiveJob and OIDC support. Let me know what you think!

Testing

1. Create a config file:

test_job:
  worker: "DummyWorker" # REQUIRED: class of the worker you're trying to schedule
  cron: "0 0 1 1 *" # REQUIRED: cron
  args: "foo" # OPTIONAL: the arguments that you want to pass to the worker
  queue: "default" #OPTIONAL:  queue name
  time_zone: "America/New_York" # OPTIONAL: the timezone that you want the job to be scheduled in (default: UTC)
  active_job: false # OPTIONAL: Whether your class represents a Cloudtasker Worker or an ActiveJob (default: false)

2. After configuring your Cloudtasker (gcp_project_id, gcp_queue_prefix, processor_host, etc), you can start using the CloudScheduler::Manager as follows:

Cloudtasker::CloudScheduler::Manager.synchronize!("/path/to/your/config/file.yml")

Manager.synchronize! will sync your GCP project's Cloud Scheduler jobs with whatever you have in the config file. It will create any jobs that you add, update stale jobs, and delete any jobs that you remove.

I didn't add a rake task since I wanted to give the end users the freedom to use the manager however they see fit. Let me know if you want me to add it back.

Thanks!

[mspringsits]

I think this would be a great addition to the project. Any suggestions on when/if this will be merged?

[MohamedBeydoun]

I think this would be a great addition to the project. Any suggestions on when/if this will be merged?

Not sure tbh 🤷 Waiting for @alachaum review 👀

[mspringsits]

I see. @alachaum Is there any help that we can provide to get this PR merged? 🤝