podman/docs/source/markdown/options/env.update.md

####> This option file is used in: ####> podman update ####> If file is edited, make sure the changes ####> are applicable to all of those.

--env, -e=env

Add a value (e.g. env=value) to the container. Can be used multiple times. If the value already exists in the container, it is overridden. To remove an environment variable from the container, use the --unsetenv option.

Note that the env updates only affect the main container process after the next start.