Fix GitHub Container Registry Authentication

[tekenstam]

Summary

This PR resolves authentication issues with GitHub Container Registry (GHCR) in our Docker image build workflow.

Changes

Authentication Fixes

• Improved authentication with GitHub Container Registry using appropriate credentials
• Updated container registry permissions in the workflow configuration
• Fixed build provenance attestation to properly work with both registries

Context

The previous image build improvements (PR #475) were unable to properly authenticate with GHCR, resulting in 403 Forbidden errors when attempting to push images. This PR specifically addresses those authentication issues.

Testing

The workflow has been tested to verify:

1. Proper authentication with both DockerHub and GitHub Container Registry
2. Correct image tagging and pushing to both registries
3. Generation of build provenance attestations

Related PRs

Builds on and fixes issues introduced in PR #475

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.13%. Comparing base (605f56f) to head (79c4858).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #475   +/-   ##
=======================================
  Coverage   46.13%   46.13%           
=======================================
  Files          40       40           
  Lines        7004     7004           
=======================================
  Hits         3231     3231           
  Misses       3617     3617           
  Partials      156      156           

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