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Niels Lohmann 087df7b0c2 Split the Ubuntu jobs into a PR set, a full set, and a nightly set

All ~100 Ubuntu jobs ran on every push to every pull request. They now
belong to three sets, chosen by each job's if: condition:

- PR set (16 configurations): every push to a pull request and every
  push. Together with the checks that always run, these jobs would
  have caught at least 92 % of the failing commits of Sep/Oct 2026.
- full set (73 configurations): after the PR set passed, on pushes and
  on pull requests with the "🚀 ready to merge" label.
- nightly set (10 configurations): Infer, Valgrind, coverage, icpc,
  icpx, nvhpc, CUDA, and ARM64; nightly on develop, on pushes to master
  and release/*, and by hand. A failed nightly run opens or updates an
  issue.

A matrix whose entries belong to different sets is split into one job
per set; the jobs share their steps through YAML anchors. No
configuration is removed: tools/ci_jobs/ci_jobs.py --compare lists 150
configurations before and after. The same tool checks in CI that every
job belongs to exactly one set, that the full set waits for the whole
PR set, and that the job table in quality_assurance.md is up to date.

The documentation describes the sets in a new section "How CI runs",
and the QA pipeline figure shows the new badges.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

2026-10-27 19:40:21 +01:00

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ci_jobs

The compiler jobs of ubuntu.yml are split into three sets, chosen by each job's if: condition (see How CI runs):

PR set: every push to a pull request, and every push to develop, master, and release/*;
full set: after the PR set passed, on pull requests with the label "🚀 ready to merge" and on every push;
nightly set: every night on develop, on every push to master and release/*, and when started by hand.

A matrix whose entries belong to different sets is split into one job per set: the full-set job gets the suffix _full, the nightly-set job _nightly, and both share their steps with the PR-set job through YAML anchors.

ci_jobs.py checks that

every job of ubuntu.yml has the if: condition of exactly one set (the conditions are in SETS),
every full-set job waits for (needs:) exactly the PR set, and nightly_report for exactly the nightly set, and
the job table in quality_assurance.md is up to date.

python3 -m venv venv && venv/bin/pip install -r tools/ci_jobs/requirements.txt
venv/bin/python tools/ci_jobs/ci_jobs.py                       # check
venv/bin/python tools/ci_jobs/ci_jobs.py --markdown            # print the job table for the documentation
venv/bin/python tools/ci_jobs/ci_jobs.py --compare origin/develop  # list configurations added or removed since develop

Use --compare when changing the workflows: a configuration that disappears fails it, so no compiler, version, or standard is dropped by accident when jobs are split, merged, or moved between sets.

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ci_jobs

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