Add support for private registry builds

[sjonpaulbrown]

Add Support for Private Registry Builds

This PR introduces support for building and pushing Docker images to a private registry. The changes include:

1. New Input private_build:

   • A new boolean input parameter private_build has been added to the workflow.
   • This parameter enables users to specify whether images should be built and pushed to a private Docker registry.

2. Enhanced Google Cloud Authentication:

   • Updated gcloud auth configure-docker logic to conditionally authenticate with the private registry (us-central1-docker.pkg.dev) when private_build is set to true. Defaults to public registry otherwise.

3. Container Registry Variable Setup:

   • Added a dedicated step to determine and set the CONTAINER_REGISTRY environment variable.
   • Dynamically chooses between PRIVATE_REGISTRY and PUBLIC_REGISTRY based on the value of the private_build input.

4. Build/Push Commands:

   • Updated all make commands to reference the CONTAINER_REGISTRY environment variable.
   • Ensures all Docker build/push commands target the correct registry.

5. Improved Workflow Modularity:

   • Extracted container registry logic into a separate step to improve clarity and reusability across build steps.

Use Case:

This enhancement is designed to support scenarios where private Docker image builds are required, such as deploying hotfixes or managing private image distributions. It maintains compatibility with existing public registry workflows while adding flexibility for private builds.

Example Workflow Executions

• Public Build
  
• Private Build

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.97%. Comparing base (74f1f9f) to head (f1572fe).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6742      +/-   ##
==========================================
- Coverage   40.98%   40.97%   -0.02%     
==========================================
  Files        2079     2079              
  Lines      183922   183922              
==========================================
- Hits        75389    75366      -23     
- Misses     102232   102253      +21     
- Partials     6301     6303       +2     

Flag	Coverage Δ
unittests	40.97% <ø> (-0.02%)	⬇️

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