Fix source repos keys in sa_roles map

[felipecrescencio-cit]

Fix source repos to allow user to create as many applications workspaces as user needs and just provide the roles (sa_roles) to user applications.
Previous to this fix user will need to provide each repo key for all applications in sa_roles map.

[bharathkkb]

Thanks for the PR @felipecrescencio-cit
I did not fully understand what you meant by Previous to this fix user will need to provide each repo key for all applications in sa_roles map.. Could you clarify the usecase?

[bharathkkb]

Synced offline. This is due to the fact that app_infra_pipeline_service_accounts keys could have more than one repo which may not be present in the sa_roles map leading to a error when looking up var.sa_roles[{local.source_repos.value}].