chore: improve docker-publish.yml flow

[jescalada]

Improves docker-publish.yml based on recent efforts to document and generalize the Docker build and Docker Hub publish flow: finos/community#396

[netlify]

✅ Deploy Preview for endearing-brigadeiros-63f9d0 canceled.

Name	Link
🔨 Latest commit	1dbb249
🔍 Latest deploy log	https://app.netlify.com/projects/endearing-brigadeiros-63f9d0/deploys/69e64f479f45b90008743b80

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.21%. Comparing base (2019faf) to head (1dbb249).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1505   +/-   ##
=======================================
  Coverage   90.21%   90.21%           
=======================================
  Files          69       69           
  Lines        5511     5511           
  Branches      944      944           
=======================================
  Hits         4972     4972           
  Misses        521      521           
  Partials       18       18           

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[kriswest]

LGTM

[jescalada]

@kriswest Just confirmed that this is still working based on the main tag getting published as usual on merge 🚀 https://hub.docker.com/r/finos/git-proxy/tags