Do not fail bundle size workflow on main branch

[yurishkuro]

Which problem is this PR solving?

• The workflow failed on main because of expected bundle size change, but the check should only be failing on PRs, on main it needs to always write out the current bundle size to artifact.

Description of the changes

• Skip compare step on main

[Copilot]

Pull request overview

Updates the bundle-size GitHub Actions workflow so the “Compare bundle sizes” step is skipped on the main branch, preventing main branch runs from failing due to bundle-size regressions.

Changes:

• Adds an additional condition to the bundle-size comparison step to skip it when running on refs/heads/main.

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[Copilot]

This if guard relies on cache-matched-key, but the workflow never saves a cache under the exact key jaeger-ui-bundle-size (it saves jaeger-ui-bundle-size-${{ github.run_id }}), so cache-matched-key will typically stay empty and the compare step will never run. Consider switching to a versioned save key (e.g. includes github.sha/run_id) and restoring via a prefix restore-keys (e.g. jaeger-ui-bundle-size-) so PRs can compare against the latest main baseline.

[Copilot]

The branch check github.ref != 'refs/heads/main' is redundant with this workflow's triggers (push only runs on main) and is inconsistent with the later Save new bundle size step which keys off github.event_name. Using github.event_name != 'push' here would be clearer and avoids subtle ref differences across events like merge_group.

Suggested change

	if: steps.cache-bundle-size.outputs.cache-matched-key != '' && github.ref != 'refs/heads/main'
	if: steps.cache-bundle-size.outputs.cache-matched-key != '' && github.event_name != 'push'

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.08%. Comparing base (d30c236) to head (b2bb549).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3653   +/-   ##
=======================================
  Coverage   89.08%   89.08%           
=======================================
  Files         304      304           
  Lines        9741     9741           
  Branches     2591     2596    +5     
=======================================
  Hits         8678     8678           
  Misses       1059     1059           
  Partials        4        4           

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