potiuk opened a new pull request, #42967:
URL: https://github.com/apache/airflow/pull/42967

   There was a problem with CI image builds when cache has been disabled - they 
still used "pre-cached" main version (unlike PROD builds). This PR synchronizes 
the behaviour between CI and PROD builds.
   
   For removing dependencies, you need to set both:
   
   * `disable docker cache` label
   * incerase DEPENDENCIES_EPOCH_NUMBER in `Dockerfile.ci`
   
   Comments and documentation in both places has been updated to reflect it.
   
   Since documentation for labels has been updated,
   Part of this PR is to improve the description of possible labels that could 
be used during the build.
   The description grew from a small number of labels to a "wall of text" that 
was difficult to read. This PR reformats it in the form of table that makes it 
far easier to see actions that the maintainer can do and what labels should be 
set for each of them.
   
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