Migrate cloud buckets to posit accounts

[machow]

Currently, the CI is running on my personal cloud accounts (which was quick to set up, since they're needed for siuba, and very cheap!). Let's make the jump to posit accounts.

The different environment variables are mostly documented in the .env.dev file, but some of the environment variables used to change the test bucket can be found in here in tests/helpers.py.

(Note that the CI sets up a folder in each test bucket using a random uuid, and then deletes the folder when tearing down tests)

[machow]

@isabelizimm do you want to take a crack at this? No urgency here! I think @juliasilge moved R pins to posit infra, so should know where all the creds etc.. are.

[juliasilge]

I've added the GCP service account token and AWS keys that I use to our internal creds store. I think Azure might still be one to figure out? I'm not finding those immediately.

[isabelizimm]

Sure thing-- I can plan to update the necessary credentials so these don't keep running on your personal accounts.