feat(build-and-test-differential): if unnecessary, completely ignore cuda build

[yhisaki]

Description

Motivation

Previously, we configured PRs without CUDA-related changes to skip the build-and-test step. However, even just pulling the CUDA image or using the self-hosted runner can sometimes cause errors, which may block PRs unrelated to CUDA. This PR prevents pulling the CUDA image and using the self-hosted runner for PRs that are unrelated to CUDA.

Modified/Added jobs

• prepare-build-and-test-differential
  • Checks if CUDA build is required and sets cuda_build output
  • Fails if tag:build-and-test-differential label is not present
• build-and-test-differential
  • Non-CUDA build that runs on both CUDA-related and non-CUDA-related PRs
• build-and-test-differential-cuda
  • Runs on CUDA-related PRs only
• clang-tidy-differential
  • Runs when CUDA build is not required (cuda_build=false)
  • Uses ubuntu-latest runner and ghcr.io/autowarefoundation/autoware:universe-devel container
• clang-tidy-differential-cuda
  • Runs when CUDA build is required (cuda_build=true)

Important

If this PR is merged, all of the jobs listed above need to be set as required. Since skipped jobs are treated as "Success", this should work correctly.

Behavior details

• If tag:build-and-test-differential does not exist (Github Actions) → Fail prepare-build-and-test-differential

  

• When a package unrelated to cuda is modified (Github Actions)

  

• When a package related to cuda is changed (Github Actions)

  

• If both are changed (Github Actions)

  

Related links

Parent Issue:

• Link

How was this PR tested?

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.48%. Comparing base (9fac554) to head (783ebe5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9520   +/-   ##
=======================================
  Coverage   29.48%   29.48%           
=======================================
  Files        1443     1443           
  Lines      108683   108683           
  Branches    41540    41540           
=======================================
  Hits        32044    32044           
  Misses      73519    73519           
  Partials     3120     3120           

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <ø> (?)
total	29.48% <ø> (ø)		Carriedforward from 42feb6a

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[mitsudome-r]

If we are splitting build-and-test-differential and build-and-test-differential-cuda as a job, then we probably don't have to use matrix

[xmfcx]

I think the separation build-and-test-differential action made its maintenance more complex and the action logs harder to read.

[yhisaki]

@mitsudome-r
Matrix has been removed. Thank you!

[yhisaki]

@xmfcx

Thank you for your review. I see your point. Could you provide more details on how splitting build-and-test-differential makes maintenance more complex or action logs harder to read? I'll consider solutions to these issues!

Alternatively, if you have other ideas for addressing the problems described in the motivation, I'd like to hear them!