Add python script and requirements to automatically create daily backups of gcp filestores

[sgibson91]

• fixes Create a python script (gcp-filestore-backups) to perform backups and retention of filestore instances #4393

[yuvipanda]

The gist of this looks right to me for a reconciliation loop! Thanks for working on this, @sgibson91.

I'd suggest to make it clearer, the main function be split into separate functions that do the various parts of the loop (get_existing_backups, create_backup_if_necessary, delete_old_backups).

[yuvipanda]

I think calling it --async is fine, as long as our logic to detect 'do we need to create another backup right now?' takes into account incomplete backups. We want to avoid running into the rate limit and also avoid endlessly creating a ton of backups (as that can cost money).

[sgibson91]

I checked and it looks like this is handled on GCP's side. I ran the script twice in a row (and remember the script is programmed to run every 10mins), and the returned JSON was already populated with the backup just created, even though it's state was "FINALIZING". So I didn't need to make any tweaks to the script here.

$ python gcp-filestore-backups.py pilot-hubs-homedirs two-eye-two-see us-central1-b
There have been no recent backups of the filestore for project two-eye-two-see. Creating a backup now...
Create request issued
Check operation [projects/two-eye-two-see/locations/us-central1/operations/operation-1720791941383-61d0d18660679-d749fa00-3bdf9958] for status. 
No outdated backups found.
...

$ python gcp-filestore-backups.py pilot-hubs-homedirs two-eye-two-see us-central1-b
[
  {
    "capacityGb": "5120",
    "createTime": "2024-07-12T13:45:41.576982250Z",
    "name": "projects/two-eye-two-see/locations/us-central1/backups/pilot-hubs-homedirs-homes-backup-2024-07-12",
    "sourceFileShare": "homes",
    "sourceInstance": "projects/two-eye-two-see/locations/us-central1-b/instances/pilot-hubs-homedirs",
    "sourceInstanceTier": "BASIC_HDD",
    "state": "FINALIZING"
  }
]
Recent backup found.
No outdated backups found.
...

[github-actions]

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