Bump msrv and ensure tests work with msrv

[nicklan]

What changes are proposed in this pull request?

cargo msrv doesn't seem to be able to check tests, so we add a new workflow to make sure cargo test at least works with our rust-version.

Incidentally, we need to bump to 1.81.0 for a test.

How was this change tested?

• PR created without bumped version
• See job fails before version bump
• bump version
• See test succeeds

[zachschuermann]

left a question but LGTM

[zachschuermann]

FYI @roeap will need to make his changes over here too :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.44%. Comparing base (be1453f) to head (54a967c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #590      +/-   ##
==========================================
- Coverage   83.46%   83.44%   -0.03%     
==========================================
  Files          74       74              
  Lines       16858    16858              
  Branches    16858    16858              
==========================================
- Hits        14071    14067       -4     
- Misses       2129     2131       +2     
- Partials      658      660       +2     

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[zachschuermann]

also heads up looks like new job failed to get the version for toolchain:

error: error: invalid value '$(cargo msrv show --path kernel/ --output-format minimal)' for '<toolchain>...': invalid toolchain name: '$(cargo msrv show --path kernel/ --output-format minimal)'

[nicklan]

also heads up looks like new job failed to get the version for toolchain:

error: error: invalid value '$(cargo msrv show --path kernel/ --output-format minimal)' for '<toolchain>...': invalid toolchain name: '$(cargo msrv show --path kernel/ --output-format minimal)'

Yeah. I'll request when it's ready. I expect to fight with actions a bit before I get this working

[zachschuermann]

also heads up looks like new job failed to get the version for toolchain:

error: error: invalid value '$(cargo msrv show --path kernel/ --output-format minimal)' for '<toolchain>...': invalid toolchain name: '$(cargo msrv show --path kernel/ --output-format minimal)'

Yeah. I'll request when it's ready. I expect to fight with actions a bit before I get this working

haha sounds good - sorry i jumped the gun a bit

[zachschuermann]

restamp

[nicklan]

closing in favor of #596