Add workflow to run the playground action with dispatch

[canercidam]

No description provided.

[claude]

Claude finished @canercidam's task in 42s —— View job

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PR Review: .github/workflows/playground-action.yaml

• Read the changed workflow file
• Check existing workflows for patterns and conventions
• Post review feedback

This PR adds a workflow_dispatch-triggered workflow to run the flashbots/builder-playground-action@v1 action with the l1 recipe.

Three inline comments posted:

1. actions/checkout@v4 → @v6 (line 10) — All other workflows in this repo use @v6. This should be consistent.
2. Misleading step name (line 12) — "Install builder-playground" doesn't accurately describe what the action does.
3. Tight timeout (line 18) — --timeout 5s is half of the 10s used in checks.yaml, and this workflow runs on slower ubuntu-latest runners rather than the warp-ubuntu-latest-x64-8x runners used elsewhere. This is likely to produce flaky failures.

[claude]

Claude finished @canercidam's task in 56s —— View job

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PR Review: .github/workflows/playground-action.yaml

• Read the updated workflow file
• Check if previous review feedback was addressed
• Compare with existing workflows for patterns
• Post updated review feedback

The latest commit (6146cae) addressed 2 of the 3 items from the previous review:

Feedback	Status
actions/checkout@v4 → @v6	Fixed
Misleading step name "Install builder-playground"	Fixed → "Run builder-playground"
--timeout 5s too tight	Still open

One remaining issue: --timeout 5s is still half of what checks.yaml uses (10s), and this workflow runs on slower ubuntu-latest runners vs the warp-ubuntu-latest-x64-8x runners in checks.yaml. This risks flaky failures. Inline comment posted with a suggestion to bump to at least 10s.