CI: ModelDB CI workflow that reuses an existing wheels artifact

[nrnhines]

Summary

When a NEURON Release (or other wheel-building run) is green through the
wheel matrix but fails only at ModelDB CI, rebuilding every wheel just to
retest ModelDB is wasteful.

This PR adds a manual workflow, ModelDB CI (reuse wheels), that:

• Takes an existing GitHub Actions wheels artifact (id or URL)
• Calls nrn-modeldb-ci with that artifact as neuron_v2
• Lets the operator choose modeldb_ci_ref (branch/tag/SHA of
  nrn-modeldb-ci to checkout for modeldb-run.yaml / runmodels)
• Optionally limits the suite via models_to_run (space-separated
  accessions; empty = all)

No wheels are built in this workflow.

Operator flow

1. Open a prior run that uploaded artifact wheels.
2. Copy the artifact id (e.g. 8935275231) or a
   https://github.com/neuronsimulator/nrn/actions/artifacts/<id> URL.
3. Actions → ModelDB CI (reuse wheels) → Run workflow (or gh workflow run
   after this file is on the default branch — GitHub only registers
   workflow_dispatch workflows from master).
4. Set neuron_v1 (e.g. neuron==9.0.1), modeldb_ci_ref (usually master),
   and optional models_to_run (e.g. 2018023 2020504 for a smoke test).

Scope note

ModelDB installs one compatible wheel from the multi-wheel zip (first that
pip accepts on the job's Python), not the full OS×Python matrix. That matches
existing nrn-modeldb-ci behavior.

Dependency

Requires the ref input on the callable modeldb-ci workflow:

• CI: add ref checkout input and run models on Python 3.12 nrn-modeldb-ci#154

Until that is merged, this workflow temporarily uses:

uses: neuronsimulator/nrn-modeldb-ci/.github/workflows/nrn-modeldb-ci.yaml@hines-grok/modeldb-ci-ref-input

Before merge to nrn master, switch that line to @master once
neuronsimulator/nrn-modeldb-ci#154 is on modeldb-ci master (or land that PR
first, then flip in this PR).

Follow-ups (out of scope here)

• Add modeldb_ci_ref to the full NEURON Release panel (same ref
  pass-through).
• Drop the temporary @hines-grok/modeldb-ci-ref-input pin after
  CI: add ref checkout input and run models on Python 3.12 nrn-modeldb-ci#154 merges.

Test plan

• Merge or land modeldb-ci-reuse-wheels.yml so the workflow is registered
  on the default branch (GitHub requirement for workflow_dispatch UI/gh)
• Ensure CI: add ref checkout input and run models on Python 3.12 nrn-modeldb-ci#154 is available (@master or keep
  temporary @hines-grok/modeldb-ci-ref-input)
• Run with wheels artifact from a completed Release (e.g. run 30997749624,
  artifact 8935275231 while unexpired), neuron_v1=neuron==9.0.1,
  modeldb_ci_ref=master, models_to_run=2018023 2020504
• Confirm normalize job builds a github.com artifact URL; ModelDB jobs
  checkout the requested ref; smoke accessions do not reintroduce the old
  "4 failed model builds" gate for those ids
  (Add 2018023 and 2020504 ModelDB CI configs nrn-modeldb-ci#153 on master)
• Optional: full suite (models_to_run empty) as a longer check
• Before merge: uses@master once CI: add ref checkout input and run models on Python 3.12 nrn-modeldb-ci#154 is
  merged

[github-actions]

✔️ 6d70d68 -> artifacts URL

[azure-pipelines]

✔️ 6d70d68 -> Azure artifacts URL

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.38%. Comparing base (cee84a6) to head (64f0f27).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3838      +/-   ##
==========================================
+ Coverage   68.34%   68.38%   +0.03%     
==========================================
  Files         701      701              
  Lines      112267   112267              
==========================================
+ Hits        76731    76774      +43     
+ Misses      35536    35493      -43     

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

✔️ 64f0f27 -> artifacts URL

[azure-pipelines]

✔️ 64f0f27 -> Azure artifacts URL

[nrnhines]

@ramcdougal Please approve. Needs to be in master for github actions to list it in "All workflows". At that point , after some testing, if the workflow needs improvment, the workflow interface allows one to choose a controller branch (PR) and increment changes til satisfied (and add documentation as well).