googleapis/google/devtools/containeranalysis/README.md

Instructions for updating the GAPIC IDLs and sanitized protos

Follow instructions at: https://g3doc.corp.google.com/company/teams/veneer/user/user-guide.md#refreshing-existing-client-libraries

Additional steps:

1. Ensure google-iam-v1 is under proto_deps in artman_containeranalysis.yaml.
2. Diff the existing containeranalysis_gapic.yaml with the updated one that was generated and ensure things like flattening and required_fields contain the correct fields and not include deprecated fields like name. See cl/175301075 for reference.
3. While we still support the deprecated google/devtools/source/v1/source_context.proto, the sanitized provenance.proto still seems to import it, remove the import statement.