Rebuild goharbor/photon image before create new harbor base images

[jUDASmILE]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

Motivation:
Currently, the goharbor/photon:5.0 image relies on a fixed snapshot from the photon 91 branch. Keeping this updated requires manual intervention—such as modifying the Dockerfile or running scheduled refreshes—which adds unnecessary maintenance overhead.

What this PR does:
This PR updates the build process to leverage the Photon team's new branching strategy by using the photon-snapshot repository as the source.

Impact:
Whenever we create new Harbor base images, the build will automatically pull the latest upstream changes (whether the Photon team releases a new snapshot or cuts a new branch). This eliminates the need for manual updates and ensures our base images are consistently up-to-date.

Issue being fixed

Fixes #(issue)

Please indicate you've done the following:

• Well Written Title and Summary of the PR
• Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• Accepted the DCO. Commits without the DCO will delay acceptance.
• Made sure tests are passing and test coverage is added if needed.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[wy65701436]

lgtm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.03%. Comparing base (889364f) to head (06a0c9f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #23248      +/-   ##
==========================================
- Coverage   66.03%   66.03%   -0.01%     
==========================================
  Files        1074     1074              
  Lines      116854   116854              
  Branches     2955     2955              
==========================================
- Hits        77168    77160       -8     
- Misses      35402    35409       +7     
- Partials     4284     4285       +1     

Flag	Coverage Δ
unittests	66.03% <ø> (-0.01%)	⬇️

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see 4 files with indirect coverage changes

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