🚧 ci: allow to override the gui image in the review apps

[oldgiova]

Allow to set a custom pre-built gui image in the review apps deployment

Ticket: QA-1525

Co-authored-with: Claude

Sample implementation:

▶ cat .gitlab/review_apps.yaml

review_app:
  gui_image: "registry.gitlab.com/northern.tech/mender/mender-server/gui:build-e0add17f213434a02e10aab8df4489220caf2723"

Result: the gui image is coming from the custom override:

▶ kk get deploy -o yaml | grep -i image:
          image: docker.io/traefik:v3.6.11
          image: registry.gitlab.com/northern.tech/mender/mender-server/create-artifact-worker:build-8b60eb136cd03c7184defc6834a475665afda650
          image: registry.gitlab.com/northern.tech/mender/mender-server/deployments:build-8b60eb136cd03c7184defc6834a475665afda650
          image: registry.gitlab.com/northern.tech/mender/mender-server/deviceauth:build-8b60eb136cd03c7184defc6834a475665afda650
          image: registry.gitlab.com/northern.tech/mender/mender-server/deviceconfig:build-8b60eb136cd03c7184defc6834a475665afda650
          image: registry.gitlab.com/northern.tech/mender/mender-server/deviceconnect:build-8b60eb136cd03c7184defc6834a475665afda650
          image: registry.gitlab.com/northern.tech/mender/mender-server/gui:build-e0add17f213434a02e10aab8df4489220caf2723
          image: registry.gitlab.com/northern.tech/mender/mender-server/inventory:build-8b60eb136cd03c7184defc6834a475665afda650
          image: registry.gitlab.com/northern.tech/mender/mender-server/iot-manager:build-8b60eb136cd03c7184defc6834a475665afda650
          image: mongo:8.0.20
          image: natsio/nats-box:0.13.8
          image: registry.gitlab.com/northern.tech/mender/mender-server/useradm:build-8b60eb136cd03c7184defc6834a475665afda650
          image: registry.gitlab.com/northern.tech/mender/mender-server/workflows:build-8b60eb136cd03c7184defc6834a475665afda650
          image: registry.gitlab.com/northern.tech/mender/mender-server/workflows:build-8b60eb136cd03c7184defc6834a475665afda650
          image: chrislusf/seaweedfs:4.17

[mzedel]

may I also propose an enterprise variant of compose/k8s/review-values.yaml.tpl, so that the job can take an REVIEW_APPS_ENTERPRISE (or similar) env var into account and use the enterprise values file + the gui override to launch the enterprise preview env from here/ the OS repo?

[oldgiova]

may I also propose an enterprise variant of compose/k8s/review-values.yaml.tpl, so that the job can take an REVIEW_APPS_ENTERPRISE (or similar) env var into account and use the enterprise values file + the gui override to launch the enterprise preview env from here/ the OS repo?

Got it, this to shorten the feedback with the gui container tested directly over the ENT deployment before the OS > ENT sync. Smart, let me try