Add steps to build and push gov container images

[gitclonebrian]

🎟️ Tracking

📔 Objective

Adds a Gov image build to the build-artifacts matrix job. For every project on main branch builds, it builds from a Dockerfile.gov variant and pushes to the Gamewarden registry using the tag syntax gov-<commit-short-sha>

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.24%. Comparing base (1d75502) to head (e6197d8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7822      +/-   ##
==========================================
- Coverage   65.67%   61.24%   -4.44%     
==========================================
  Files        2195     2195              
  Lines       97542    97542              
  Branches     8807     8807              
==========================================
- Hits        64062    59736    -4326     
- Misses      31259    35680    +4421     
+ Partials     2221     2126      -95     

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