PR workflow: testing

[cellistigs]

In the future, it would be great to add additional features:

• run tests automatically on pull request to make sure nothing fishy is going on (although we'd have to approve tests running on forks somehow too).
  • This is already done! The pr requires that status checks pass before starting a deployment. Kind of annoying, but okay.
• have additional tags #develop:{stackname}, #test:{stackname} to deploy a testing version, or even a localstack version before touching production analyses.
  • you can link these to the iac_utils/build.sh and iac_utils/test_main.sh scripts IF you correctly format and put data into the given buckets.
• have additional deployment environments, and link those urls to the analyses, or websites in aws.
• Handle different regions.