chore: add make help cmd

[yyzxw]

Thank you for contributing to Harbor!

add make help command, result:

Comprehensive Summary of your change

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.

[codecov]

Codecov Report

Merging #18936 (9bf2d16) into main (ff2b99d) will decrease coverage by 22.72%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main   #18936       +/-   ##
===========================================
- Coverage   67.39%   44.68%   -22.72%     
===========================================
  Files         986      236      -750     
  Lines      107994    13178    -94816     
  Branches     2698     2698               
===========================================
- Hits        72786     5888    -66898     
+ Misses      31309     6996    -24313     
+ Partials     3899      294     -3605     

Flag	Coverage Δ
unittests	44.68% <ø> (-22.72%)	⬇️

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see 752 files with indirect coverage changes

[yyzxw]

/release-note ignore-for-release

[yyzxw]

/retest

[github-actions]

This PR is being marked stale due to a period of inactivty. If this PR is still relevant, please comment or remove the stale label. Otherwise, this PR will close in 30 days.

[github-actions]

This PR was closed because it has been stalled for 30 days with no activity. If this PR is still relevant, please re-open a new PR against main.