CI/CD - Clean up image builds, remove cuda 12.8/12.4/12.2 and add cuda13.0 merge

[polarG]

Description

Clean up the Docker image build matrix in build-image.yml.

Changes

• Remove the docker-build entries for cuda 12.8, 12.4, and 12.2.
• Remove the corresponding cuda12.8 docker-merge entry and add a cuda13.0 merge entry (merging amd64 + arm64), alongside the existing cuda12.9 merge.
• Add fail-fast: false to the docker-merge matrix so a failed merge for one CUDA version does not cancel the other merge legs. The job keeps if: ${{ !cancelled() }} so merges still run as long as the workflow was not cancelled.

Notes

• The docker-merge condition is intentionally !cancelled() (not success()): the docker-build matrix uses fail-fast: false because the self-hosted ROCm build can fail transiently, and we don't want a flaky ROCm build to block merging the CUDA images.

[Copilot]

Pull request overview

This PR updates the GitHub Actions Docker image build workflow to simplify the CUDA build/merge matrix by removing older CUDA versions and adding a multi-arch merge for CUDA 13.0.

Changes:

• Removed cuda12.8 image builds (arm64/amd64) and removed cuda12.4 / cuda12.2 image builds.
• Added a docker-merge matrix entry to publish a merged multi-arch cuda13.0 tag.
• Changed the docker-merge job condition from running when not cancelled to running only on overall success.

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[Copilot]

Pull request overview

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.02%. Comparing base (e271df3) to head (3ae7719).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #819   +/-   ##
=======================================
  Coverage   86.02%   86.02%           
=======================================
  Files         103      103           
  Lines        7950     7950           
=======================================
  Hits         6839     6839           
  Misses       1111     1111           

Flag	Coverage Δ
cpu-python3.10-unit-test	70.88% <ø> (ø)
cpu-python3.12-unit-test	70.88% <ø> (ø)
cpu-python3.7-unit-test	70.31% <ø> (ø)
cuda-unit-test	83.95% <ø> (ø)

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