Update CI to use julia-actions/cache and 1.12 + fixes for 1.12

[nickrobinson251]

• Update CI to use julia-actions/cache and also test against (unreleased) Julia version 1.12 (close Switch CI to use julia-actions/cache #207)
  • tests and not yet required to pass on v1.12 (given it's not released yet)
• Fix one genuine v1.12 issue in the code: skip keyword implementation had world age issues

ERROR: UndefVarError: `##skip#279` not defined in `Main.var"##skip_JET error analysis RAI_CompilationsCache package#278"`
The binding may be too new: running in world age 38585, while current world is 38587.
Stacktrace:
  [1] should_skip(ti::TestItem)
    @ ReTestItems ~/.julia/packages/ReTestItems/SUewn/src/ReTestItems.jl:998
  [2] runtestitem(ti::TestItem, ctx::ReTestItems.TestContext; test_end_expr::Expr, logs::Symbol, verbose_results::Bool, finish_test::Bool, catch_test_error::Bool, failfast::Bool)
    @ ReTestItems ~/.julia/packages/ReTestItems/SUewn/src/ReTestItems.jl:1038

• document walkdir assumption (following walkdir behaviour change in v1.12 JuliaLang/julia#59092) and update tests accordingly
• update test regex (following Profile: add threadpool names to Profile.print JuliaLang/julia#54994)

This leaves one test still failing on v1.12 (the test runtests() TestProjectFile.jl)

[Copilot]

Pull Request Overview

This PR updates the CI configuration to test against Julia 1.12 and fixes compatibility issues identified during testing. The main purpose is to ensure the package remains compatible with the upcoming Julia 1.12 release while modernizing the CI setup.

• Update CI to use julia-actions/cache action and test against Julia 1.12-rc1
• Fix world age issues in the skip keyword implementation that caused errors in Julia 1.12
• Update test patterns to accommodate changes in Julia 1.12's output formatting

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/CI.yml	Updates CI to use julia-actions/cache and test Julia 1.12-rc1 instead of 1.11
src/ReTestItems.jl	Fixes world age issues in should_skip function and adds documentation comment
test/workers.jl	Updates regex patterns to handle Julia 1.12's thread pool output format
test/integrationtests.jl	Updates error message expectations for Julia 1.12 compatibility
test/internals.jl	Fixes test setup to use proper project file path and imports should_skip function

Comments suppressed due to low confidence (1)

.github/workflows/CI.yml:22

• The version '~1.12.0-rc1' may not be a valid Julia version specifier. Consider using 'nightly' or '1.12-rc' instead, as release candidate versions typically use different naming conventions in julia-actions/setup-julia.

          - '~1.12.0-rc1'

[Drvi]

The failing runtests() TestProjectFile.jl passes with JuliaTesting/TestEnv.jl#98

[Drvi]

Thanks! I think we can get the rest of the test passing later on