Documentation in:

https://g3doc.corp.google.com/company/teams/flutter/security/cirrus/index.md?cl=head#create-a-new-key

These keys will expire on Aug 15, and should be updated 1 week in advance.

Also, need to renew plugins firebase account.

https://pantheon.corp.google.com/iam-admin/serviceaccounts/details/107738294387118941537/keys?project=flutter-cirrus