docker_image: Fix idempotency of pull (#31956)
docker_image: Fix idempotency of pull (#31956)

when pulling an image with force=yes the task was marked as changed
everytime even when the image hasn't changed.

This was due to a bad comparison of the image tag before the pull
and after the pull.

Fixes #22596

Signed-off-by: Alberto Murillo <ab5290a331f6b737640c32c8bb23ca6ef6c7307d@gmail.com>
thaim/ansible,thaim/ansible