public DefaultCredentialRetrievers setKnownCredential(
      Credential knownCredential, String credentialSource) {
    knownCredentialRetriever = credentialRetrieverFactory.known(knownCredential, credentialSource);
    return this;
  }
Sets the known {@link Credential} to use in the default credential retrievers.

@param knownCredential the known credential
@param credentialSource the source of the known credential (for logging)
@return this
jib-plugins-common/src/main/java/com/google/cloud/tools/jib/plugins/common/DefaultCredentialRetrievers.java