Ability to Choose Region for Builder Test Execution (EU Region Needed)

[lukewatters-airbyte]

Request
Please provide the ability to specify the execution region for Builder Tests, with support for an EU region.

Rationale
Data residency and compliance requirements restrict some organizations from running workloads outside the EU, limiting use of the Connector Builder.

Outcome
Region selection would enable compliant use of Builder functionality in regulated environments.