Include TagSession privilege for assumed roles. #189
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Summary
I'm working with GitHub Actions - its canonical AWS credentials action requires that 'sts:TagSession' permissions be granted for role assumption:
https://github.com/aws-actions/configure-aws-credentials#permissions-for-assuming-a-role
I'm not sure if we have a policy reason for denying this permission (if so, I can look into alternative auth methods) but it seemed like a minor behavior change.
Test Plan
Say unittests, or list out steps to verify changes.
References
This change enables a pretty straighforward ECR build&push pipeline via GHA: https://github.com/chanzuckerberg/tfe-docker/blob/actiontest/.github/workflows/daily-rebuild.yml