Generate private keys for service accounts locally

[hannes-ucsc]

This post describes how to generate the private key locally and only upload the public one, so that even Google doesn't know the private key.

https://binx.io/2021/03/08/how-to-create-your-own-google-service-account-key-file/

We'd still have to deposit the private key in ASM but it still reduces the number of parties that know the private key.

• [ ] Security design review completed; the Resolution of this issue does not …
  • [ ] … affect authentication; for example:
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[nolunwa-ucsc]

discussed on 10/24 and current prioritization is correct