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Remove AIRFLOW_GID from Docker images - #18747
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The AIRFLOW_GID parameter was in the images for historical reasons, however for a long time we recommend everyone to use GID=0 in order to make it possible to run the image with Arbitrary UID. Setting different group than 0 has NO VALUE actually. You can still override the group of user when starting the container, so the only real difference is that the "airflow" unmodifiable files such as python code belong to different group, which has no real value. You can still use whatever group you want for mounted files and modifiable resources. Airflow Docker image will work perfectly fine when the main group of the user is 0 (and we also have to remember that if the user belongs to other groups in the host, it will also belong to those group inside the container, AIRFLOW_GID has only influence on primary group of that user IN-CONTAINER (not outside of it). Removing AIRFLOW_GID seems like best choice for Airflow 2.2. Fixes: apache#18709
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The AIRFLOW_GID parameter was in the images for historical reasons,
however for a long time we recommend everyone to use GID=0 in order
to make it possible to run the image with Arbitrary UID. Setting
different group than 0 has NO VALUE actually. You can still
override the group of user when starting the container, so the only
real difference is that the "airflow" unmodifiable files such as
python code belong to different group, which has no real value.
You can still use whatever group you want for mounted files and
modifiable resources. Airflow Docker image will work perfectly fine
when the main group of the user is 0 (and we also have to remember
that if the user belongs to other groups in the host, it will also
belong to those group inside the container, AIRFLOW_GID has only
influence on primary group of that user IN-CONTAINER (not outside
of it).
Removing AIRFLOW_GID seems like best choice for Airflow 2.2.
Fixes: #18709
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