add BUILD_INSTALLER parameter for optionally build prepare and log container

[MinerYang]

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Comprehensive Summary of your change

add BUILD_INSTALLER parameter to optional build prepare and log container when only need build offline_installer

Issue being fixed

Fixes #(issue)

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• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 65.87%. Comparing base (c8c11b4) to head (8eb9ff5).
Report is 504 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #22148       +/-   ##
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+ Coverage   45.36%   65.87%   +20.50%     
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  Files         244     1072      +828     
  Lines       13333   115713   +102380     
  Branches     2719     2925      +206     
===========================================
+ Hits         6049    76226    +70177     
- Misses       6983    35262    +28279     
- Partials      301     4225     +3924     

Flag	Coverage Δ
unittests	65.87% <ø> (+20.50%)	⬆️

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[Copilot]

Pull Request Overview

Add a BUILD_INSTALLER flag to control whether the prepare and log containers are built and included in the offline installer.

• Introduce a conditional buildcompt target in make/photon/Makefile to skip _build_prepare and _build_log when BUILD_INSTALLER=false
• Update BUILDBASETARGET and DOCKERSAVE_PARA in the top-level Makefile to respect the new flag and pass it into build containers
• Add a check_buildinstaller guard for the package_offline target to enforce BUILD_INSTALLER=true

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
make/photon/Makefile	Replace hardcoded build: dependencies with a conditional buildcompt based on BUILD_INSTALLER
Makefile	Default BUILD_INSTALLER=true, adjust BUILDBASETARGET, DOCKERSAVE_PARA, expose flag in build container, and guard the package_offline target

Comments suppressed due to low confidence (2)

make/photon/Makefile:237

• [nitpick] The target name 'buildcompt' is ambiguous; consider renaming it to a more descriptive name like 'build_components' for clarity.

buildcompt: _build_prepare _build_db _build_portal _build_core _build_jobservice _build_log _build_nginx _build_registry _build_registryctl _build_trivy_adapter _build_redis _compile_and_build_exporter

Makefile:458

• [nitpick] Consider rephrasing this error message to 'BUILD_INSTALLER must be set to "true" to use package_offline target' for better readability.

		echo "Must set BUILD_INSTALLER as true while triggering package_offline build" ; \

[wy65701436]

lgtm