The Ubuntu-20.04 brownout takes place from 2025-02-01. For more details, see https://github.com/actions/runner-images/issues/11101

Failed to save: Failed to CreateCacheEntry: Received non-retryable error: Failed request: (409) Conflict: cache entry with the same key, version, and scope already exists

FromAsCasing: 'as' and 'FROM' keywords' casing do not match More info: https://docs.docker.com/go/dockerfile/rule/from-as-casing/