Update docker nightly workflow to use GPU runner since these have more space

[agunapal]

Description

Update docker nightly build to use CI GPU runner

• Cleanup built docker images

Fixes #(issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Feature/Issue validation/testing

Passing Run
https://github.com/pytorch/serve/actions/runs/6152373521/job/16694390169?pr=2586

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[codecov]

Codecov Report

Merging #2586 (b290c57) into master (719785d) will decrease coverage by 0.08%.
The diff coverage is n/a.

❗ Current head b290c57 differs from pull request most recent head a560e9b. Consider uploading reports for the commit a560e9b to get more accurate results

@@            Coverage Diff             @@
##           master    #2586      +/-   ##
==========================================
- Coverage   70.87%   70.79%   -0.08%     
==========================================
  Files          83       83              
  Lines        3839     3839              
  Branches       58       58              
==========================================
- Hits         2721     2718       -3     
- Misses       1114     1117       +3     
  Partials        4        4              

see 1 file with indirect coverage changes

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