Investigate automating docker base image updates

[kernelsam]

See PR for example:
https://github.com/senzing-factory/github-util/pull/99/files
We are currently bumping base image versions and sha digest values by hand. This issue is to investigate removing the human intervention here to auto open PRs against repositories for minor and patch version updates images.

Issues:

• BASE_IMAGE instead of FROM declaration in dockerfiles
• layered build images
  • https://github.com/Senzing/entity-search-web-app/blob/main/Dockerfile