Clean up disk sapce during docker image build for `transformers-pytorch-gpu`
# What does this PR do?

PyTorch pipeline CI job start to fail due to 
```bash
 ImportError: accelerate>=0.20.3 is required for a normal functioning of this module, but found accelerate==0.20.2.
Try: pip install transformers -U or pip install -e '.[dev]' if you're working with git main
```

**The root cause is: docker image for this job failed to build due to disk space issue**
```bash
RROR: Could not install packages due to an OSError: [Errno 28] No space left on device
```

As usual, let's us save Space!
_The documentation is not available anymore as the PR was closed or merged._