chore(e2e): Add workflow for running admin ui tests

[moduli]

Description

This PR adds a workflow to run Admin UI e2e tests against the binary built in CI. This is to assist with release testing.

Here's an example run: https://github.com/hashicorp/boundary/actions/runs/23872207204/job/69607768896 (I modified the trigger rules in this run to trigger on PR changes, but the workflow is intended to only trigger on release branches).

https://hashicorp.atlassian.net/browse/ICU-18378

PCI review checklist

• I have documented a clear reason for, and description of, the change I am making.
• If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.
• If applicable, I've documented the impact of any changes to security controls.
  Examples of changes to security controls include using new access control methods, adding or removing logging pipelines, etc.

[moduli]

The UI Version needed to be updated to include some e2e test changes in boundary-ui

[Copilot]

Pull request overview

Adds a reusable GitHub Actions workflow to provision Enos UI test infrastructure and run Boundary Admin UI Playwright e2e tests against CI-built artifacts (intended for release-branch validation).

Changes:

• Introduces a new reusable workflow (enos-run-admin-ui.yml) that launches Enos UI scenarios and runs Admin UI e2e tests from the boundary-ui repo at the embedded UI SHA.
• Wires the new workflow into the main build.yml pipeline for release branches.
• Refactors Enos UI e2e scenario/module plumbing to stop running UI tests inside the Terraform module and instead use it to expose environment variables for the external test runner.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
internal/ui/VERSION	Updates the embedded UI commit SHA used by Boundary.
enos/modules/test_e2e_ui/main.tf	Removes local test execution wiring; module now effectively only publishes env vars via state.
enos/enos-scenario-e2e-ui-docker.hcl	Drops now-unused variables previously required to run UI tests from local paths.
enos/enos-scenario-e2e-ui-aws.hcl	Drops now-unused variables previously required to run UI tests from local paths.
.github/workflows/enos-run-admin-ui.yml	Adds reusable workflow to provision infra, checkout boundary-ui, and run Playwright Admin UI e2e tests.
.github/workflows/build.yml	Adds e2e-admin-ui job that calls the new reusable workflow on release branches.

Comments suppressed due to low confidence (1)

enos/modules/test_e2e_ui/main.tf:244

• enos_local_exec.run_e2e_test is now hardcoded to run an empty inline command, which means this module no longer executes the UI e2e tests and test_results will always be empty. If the intent is to move test execution fully into GitHub Actions, consider renaming/adjusting the module output (or adding a flag) so consumers don’t assume this step actually runs tests.

  inline = [""]
}

output "test_results" {
  value = enos_local_exec.run_e2e_test.stdout
}

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