Builder CI

Workflow runs for Builder CI

• Add builder playground

  failed:
  Builder CI#2:Commit8b35d83pushedbychunter-cb
  account-abstraction

  Jan 15, 20267m 13s
  More actions for workflow run 2

• Mempool scaffold

  completed successfully:
  Builder CI#1:Commit13d5f1bpushedbychunter-cb
  account-abstraction

  Jan 13, 202611m 32s
  More actions for workflow run 1