potiuk opened a new pull request, #30813:
URL: https://github.com/apache/airflow/pull/30813

   Some of our users raised issues that when extending the image, airflow 
suddenly started reporting problem with database versions and migration not 
aplied or out-of-sync. This almost always turns out to be a dependency 
conflict, that leads to automated downgrate or upgrade of installed airflow 
version. This is - obviously - undesired (you should be upgrading airflow 
consciously rather than accidentally). However there is no way to do it 
implicitly - `pip` might decide to upgrade or downgrade airflow as it sees fit. 
From the point of view - airflow is just one of the packages and has no special 
meaning.
   
   The only way to "keep" airflow version is to specify it together with other 
requirements, pinned to the specific version. This PR updates our examples to 
do this and explains why airflow is added there.
   
   There is - of course - another risk that the user will forget to update the 
version of airflow when they upgrade, however, sinc this is explicit action 
performed during image extension, it is much easier to diagnose and notice. We 
also warn the users that they should upgrade when airflow is upgraded.
   
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