chore: 🤖 use the same packages in all the docker imges
we could surely build a base image, if somebody wants to do it...

it should fix the following error message we see in the admin service logs:

```
/src/services/admin/.venv/lib/python3.9/site-packages/pydub/utils.py:170: RuntimeWarning: Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work 
  warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)
```
chore: 🤖 use the same packages in all the docker imges: we could surely build a base image, if somebody wants to do it...

it should fix the following error message we see in the admin service logs:

```
/src/services/admin/.venv/lib/python3.9/site-packages/pydub/utils.py:170: RuntimeWarning: Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work 
  warn("Couldn't find ffmpeg or avconv - defaulting to ffmpeg, but may not work", RuntimeWarning)
```