Use non-large arm runner for Nix

[lloeki]

What does this PR do?

Use ubuntu-24.04-arm.

Motivation:

As visible in repo Insights Actions Usage Metrics the arm-4core-linux-ubuntu24.04 variant is a hosted-larger which may not be free.

Change log entry

None.

Additional Notes:

See: https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/

Parametric tests would be the last one using a hosted-larged runner type:

https://github.com/DataDog/system-tests/blob/abb550d5ea74ff1cc4c9f455bb18dc0fa085e1d4/.github/workflows/run-parametric.yml#L46-L48

To get control over runs-on: it would need a change like:

on:
  workflow_call:
    inputs:
      runs_on:
        description: "Runner definition"
        default: '{ "group": "APM Larger Runners" }'
        required: false
        type: string

jobs:
  parametric:
    runs-on: ${{ fromJson( inputs.runs_on ) }}

Then a change here:

dd-trace-rb/.github/workflows/parametric-tests.yml

Lines 56 to 67 in 917747b

	parametric:
	needs:
	- build-artifacts
	- changes
	if: ${{ needs.changes.outputs.changes == 'true' }}
	uses: DataDog/system-tests/.github/workflows/run-parametric.yml@main
	secrets: inherit
	with:
	library: ruby
	binaries_artifact: system_tests_binaries
	job_count: 8
	job_matrix: "[1,2,3,4,5,6,7,8]"

to:

  parametric:
    with:
      library: ruby
      binaries_artifact: system_tests_binaries
      job_count: 16
      job_matrix: "[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16]"
      runs_on: "ubuntu-24.04"

How to test the change?

• CI should pass
• Insights should report hosted instead of hosted-larger.

[datadog-datadog-prod-us1]

Datadog Report

Branch report: lloeki/use-non-large-arm-runner
Commit report: 81d1ffa
Test service: dd-trace-rb

✅ 0 Failed, 20604 Passed, 1374 Skipped, 3m 13.61s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-21 11:12:14

Comparing candidate commit 81d1ffa in PR branch lloeki/use-non-large-arm-runner with baseline commit 29a6bd8 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (29a6bd8) to head (81d1ffa).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4420   +/-   ##
=======================================
  Coverage   97.72%   97.72%           
=======================================
  Files        1365     1365           
  Lines       83337    83336    -1     
  Branches     4219     4219           
=======================================
+ Hits        81440    81444    +4     
+ Misses       1897     1892    -5     

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