Fix Docker build rules to use $CI_DEFAULT_BRANCH

Dan Notesteinrequested to merge
fix/docker-build-detection-rules into develop

Summary

The Docker image build rules were broken for the develop branch:

The bug: Rules checked for main branch, but this repo uses develop as the default branch.

  • Rule 1 checked $CI_COMMIT_BRANCH == "main" - never matched
  • Rule 2 applied to develop (since develop !~ /^main$/), but used compare_to: refs/heads/develop
  • When ON develop, comparing to develop shows zero changes, so builds never ran

The fix:

  • Replace hardcoded "main" with $CI_DEFAULT_BRANCH
  • Replace regex !~ /^main$/ with != $CI_DEFAULT_BRANCH

Also adds allow_failure: true to buildkit_cache_cleanup since it's a maintenance task that shouldn't block pipelines.

Impact

This fixes the issue where Docker images weren't rebuilt on develop even when their source files changed.

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