chore: make runs-on configurable through variables

[remyleone]

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.56%. Comparing base (f865d4c) to head (22eb064).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5392   +/-   ##
=======================================
  Coverage   54.56%   54.56%           
=======================================
  Files         317      317           
  Lines       70500    70500           
=======================================
  Hits        38470    38470           
  Misses      30559    30559           
  Partials     1471     1471           

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[Copilot]

Pull request overview

Updates GitHub Actions workflows to make the runner label configurable via a repository/org variable, while preserving ubuntu-latest as the default.

Changes:

• Replace hardcoded runs-on: ubuntu-latest with runs-on: "${{ vars.RUNS_ON || 'ubuntu-latest' }}" across workflows.
• Apply the change consistently to build, lint, docs, release, and scheduled workflows.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.github/workflows/wasm.yml	Make the wasm build/test runner configurable via vars.RUNS_ON.
.github/workflows/tests.yml	Make the others job runner configurable via vars.RUNS_ON (matrix job unchanged).
.github/workflows/release.yml	Make both goreleaser and wasm job runners configurable via vars.RUNS_ON.
.github/workflows/purge.yml	Make the sweeper runner configurable via vars.RUNS_ON.
.github/workflows/nightly.yml	Make nightly + sweepers runners configurable via vars.RUNS_ON.
.github/workflows/lint.yml	Make all lint job runners configurable via vars.RUNS_ON.
.github/workflows/labeler.yml	Make the labeler runner configurable via vars.RUNS_ON.
.github/workflows/docs.yml	Make docs generation and link-check runners configurable via vars.RUNS_ON.
.github/workflows/deploy-docs.yml	Make docs deployment runner configurable via vars.RUNS_ON.
.github/workflows/coverage.yml	Make coverage runner configurable via vars.RUNS_ON.
.github/workflows/codeql-analysis.yml	Make CodeQL analysis runner configurable via vars.RUNS_ON.
.github/workflows/build.yml	Make build and docker job runners configurable via vars.RUNS_ON.
.github/workflows/announce.yml	Make release announcement runner configurable via vars.RUNS_ON.

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