chore: Fixed workflow to prevent terraform tests from failing

[cm-iwata]

Currently, ubuntu-latest is specified as the Runner in Git Hub Actions, but ubuntu-latest will soon be changed to point to ubuntu-24.04.

The ubuntu-24.04 Runner does not have a built-in Terraform command, so terraform tests will suddenly fail one day.

• https://github.blog/changelog/2024-11-05-notice-of-breaking-changes-for-github-actions/
• Ubuntu-latest workflows will use Ubuntu-24.04 image actions/runner-images#10636

I used a forked repository to perform the following tests.

• I explicitly specified ubuntu-24.04 at the runs-on and confirmed that the test failed.
  • https://github.com/cm-iwata/moto/actions/runs/12453251643/job/34763159915
• I then added a step to setup Terraform and confirmed that the test was successful.
  • https://github.com/cm-iwata/moto/actions/runs/12453304689/job/34763283277

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.60%. Comparing base (db93058) to head (e93f3f2).
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8428   +/-   ##
=======================================
  Coverage   94.60%   94.60%           
=======================================
  Files        1163     1163           
  Lines      101638   101639    +1     
=======================================
+ Hits        96152    96153    +1     
  Misses       5486     5486           

Flag	Coverage Δ
servertests	28.84% <ø> (-0.01%)	⬇️
unittests	94.57% <ø> (+<0.01%)	⬆️

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[bblommers]

Nitpick - but can we keep this as latest? Just to prevent future maintenance 🙂

[cm-iwata]

If use the latest label, there is a risk that tests will suddenly fail one day due to compatibility issues.
That's why I explicitly specified runner version in this PR.

However, if compatibility is maintained when upgrading Runner, as you say, unnecessary maintenance will occur when upgrading.

Both approaches have advantages and disadvantages, but I think it's better to follow a unified policy across the project, so we I modified it to use latest.

e93f3f2

[bblommers]

Thank you!