Add test workflow for Docker images

[super-harsh]

What this PR does / why we need it:

Adds a test workflow to be used in another branch to test out Docker image push action with buildx.

[codecov-commenter]

Codecov Report

Merging #3345 (a3880e1) into main (e3ba2c5) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head a3880e1 differs from pull request most recent head 7521459. Consider uploading reports for the commit 7521459 to get more accurate results

@@            Coverage Diff             @@
##             main    #3345      +/-   ##
==========================================
- Coverage   54.51%   54.51%   -0.01%     
==========================================
  Files        1495     1495              
  Lines      630865   630865              
==========================================
- Hits       343934   343923      -11     
- Misses     230571   230574       +3     
- Partials    56360    56368       +8     

see 24 files with indirect coverage changes