Missing tags on Docker Hub after version 4.9.1
## Environment info

- `transformers` version: > 4.9.1

### Who can help

@mfuntowicz ?

## Information

https://hub.docker.com/r/huggingface/transformers-pytorch-gpu/tags

I was expecting 1 tag per transformers version on the docker hub, but the most recent tag (aside from `latest`) is for 4.9.1 and was pushed on July 26, 2021.

## To reproduce

Steps to reproduce the behavior (and see existing tags):

1. Either visit https://hub.docker.com/r/huggingface/transformers-pytorch-gpu/tags and sort by Newest
2. Or run `wget -q https://registry.hub.docker.com/v1/repositories/huggingface/transformers-pytorch-gpu/tags -O - | sed -e 's/[][]//g' -e 's/"//g' -e 's/ //g' | tr '}' '\n'  | awk -F: '{print $3}'`

Current tags available:

```
latest
2.10.0
2.11.0
2.6.0
2.7.0
2.8.0
2.9.0
2.9.1
3.0.0
3.0.1
3.0.2
3.1.0
3.2.0
3.3.0
3.3.1
3.4.0
3.5.0
3.5.1
4
4.0.0
4.0.1
4.1.0
4.1.1
4.2.0
4.2.1
4.2.2
4.3.0
4.3.1
4.3.2
4.3.3
4.4.0
4.4.1
4.4.2
4.5.0
4.5.1
4.6.1
4.7.0
4.8.0
4.8.1
4.8.2
4.9.0
4.9.1
````

## Expected behavior

Each time a image is pushed with the `latest` tag, it could also be tagged with the current version number, like it was before version 4.9.1. (I was expecting to see 4.16.2 for example)

cc'ing @mfuntowicz (among others)<|||||>Hey! We indeed stopped pushing images a while back, but we've started doing so again a few weeks ago. It makes sense to push images with the versions.

Will try to make some time and do so.<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.