fix: add --ignore-engines to Cypress Dockerfile

[blegesse-w]

Summary

• The cypress-slim:9.5.2-included base image runs Node 18.12.1, but @peculiar/x509@1.14.3 (a transitive dep) now requires Node >= 20
• Since the Dockerfile does a fresh yarn add with no lockfile, it picks up the latest version and fails the engine check
• This is breaking build-e2e-image in monitor-ci across all branches
• Adds --ignore-engines to unblock until the cypress-slim base image is updated to Node 20+

Test plan

• monitor-ci build-e2e-image job passes

🤖 Generated with Claude Code

[blegesse-w]

hey @jdstrand, while working on the webpack-dev-server bump (#7176), i found that the monitor-ci build-e2e-image failure is actually unrelated to that PR. the cypress-slim base image is on Node 18, and @peculiar/x509 (a transitive dep) just released a version requiring Node 20+. the Dockerfile does a fresh yarn add with no lockfile so it picks up the latest and fails the engine check. and this was breaking all branches, not just mine. put up this pr #7177 to add --ignore-engines to the yarn add. it only affects the cypress test container, not production, and all checks pass. once that merges, the webpack-dev-server PR should go green too.

[jdstrand]

@blegesse-w - I see you tried to merge this, so I tried a few more times, but it keeps getting kicked back. I have not looked into why....

[blegesse-w]

@blegesse-w - I see you tried to merge this, so I tried a few more times, but it keeps getting kicked back. I have not looked into why....

thanks for trying, Jamie. I don't think the failure is related to this PR. it's a flaky integration test failing with assert_equal(): [Reason: dbase over null (nil)], which looks like the test environment's database isn't coming up properly? idk. I will look into the monitor-ci test infra

[blegesse-w]

@jdstrand hey jamie, i traced the monitor-ci failure all the way down. the pipeline gets created (22910) but the setup workflow fails at the "Generate .circleci/config-dynamic.json" step. the error is a curl 401 Unauthorized during config generation. looks like a credential used in the monitor-ci dynamic config setup has expired. this will def block all PRs from merging, not just mine. I will check the monitor-ci project's environment variables / contexts in CircleCI. the specific error output is: filterTestsDisabledInConfigCat: skipping as UIE2ESkipConfigCat is set curl: (22) The requested URL returned error: 401 Exited with code exit status 22

[blegesse-w]

update on the monitor-ci blocker: the UI_CI_TOKEN (github PAT on the team-ui-bot-influx account) had expired. i rotated it with a 90-day expiration and updated it in monitor-ci's circleci settings.

[blegesse-w]

quay.io is having a major outage 😭 pushes are disabled registry-wide. nothing we can do until they resolve it. i'll re-add to the merge queue once quay is back up.