Use appropriate context in metadata-action

[lucacome]

Proposed changes

docker/metadata-action now supports setting the context for generating the metadata.
When the workflow runs to update the docker images, we checkout the tag and the action can now read info like the sha from the appropriate context.

[codecov]

Codecov Report

Merging #3796 (50228e6) into main (5439951) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3796      +/-   ##
==========================================
- Coverage   52.38%   52.37%   -0.02%     
==========================================
  Files          59       59              
  Lines       16890    16890              
==========================================
- Hits         8848     8846       -2     
  Misses       7747     7747              
- Partials      295      297       +2     

see 2 files with indirect coverage changes

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