ci: revert the env: blocks that invalidated Tests.yml and SublibraryCI.yml

[ChrisRackauckas-Claude]

Note

Draft — please ignore until reviewed by @ChrisRackauckas.

Targets as/fix-ci (#4867), not master. I don't have push access to that branch, hence a PR into it.

Problem

0d3a55fde ("ci: disable eager precompilation in test jobs") adds an env: map to the two jobs that call reusable workflows with uses:. GitHub's schema doesn't allow that key there, and the failure mode is not "the env is ignored" — the entire workflow file becomes invalid and no jobs are created:

$ actionlint .github/workflows/Tests.yml .github/workflows/SublibraryCI.yml
.github/workflows/Tests.yml:30:5: when a reusable workflow is called with "uses", "env" is not available.
  only following keys are allowed: "name", "uses", "with", "secrets", "needs", "if", and "permissions" in job "tests" [syntax-check]
.github/workflows/SublibraryCI.yml:27:5: ... in job "sublibrary-ci" [syntax-check]
exit=1

That's why #4867 currently has no Tests and no Sublibrary CI checks. The runs exist but are listed by file path with zero jobs:

$ gh api "repos/SciML/ModelingToolkit.jl/actions/runs?head_sha=40379c7e3..."
.github/workflows/SublibraryCI.yml   failure   push
.github/workflows/Tests.yml          failure   push

$ gh run view 30901431064
X This run likely failed because of a workflow file issue.

Worth stating explicitly, since it came up as the suspected cause: this is not a path-filtering problem. Sublibrary test-only changes do select the sublibrary — compute_affected_sublibraries.jl puts any lib/<pkg>/** change into the direct set (only reverse-dep propagation is gated on src//Project.toml), and the root grouped-tests.yml matrix isn't diff-filtered at all:

$ echo "lib/ModelingToolkitBase/test/symbolic_events.jl" | \
    julia .sciml-dotgithub/scripts/compute_affected_sublibraries.jl . --projects-matrix

→ 25 cells, the full lib/ModelingToolkitBase group × version expansion. And #4843, which touched only lib/ModelingToolkitBase/test/bvproblem.jl, ran both Tests and Sublibrary CI.

Change

Revert the two env: blocks. Both files are byte-identical to master again and lint clean:

$ actionlint .github/workflows/*.yml
exit=0

The rest of #4867 (the BVP group split, the tolerance updates) is untouched.

Getting the precompile setting back

It has to be an input on the reusable workflows. SciML/.github#125 adds auto-precompile to tests.yml (job-level, so it covers julia-buildpkg too) and forwards it from grouped-tests.yml and all four sublibrary-project-tests.yml shards. Once that merges and v1 is retagged, these two callers become:

    with:
      check-bounds: auto
      auto-precompile: false

Note v1 only moves when a vX.Y.Z release tag is pushed, so that second step has to wait for a release cut.

🤖 Generated with Claude Code

https://claude.ai/code/session_0172My4BE5TgvJmuYxkBuvxU