[stable/zed] Improve CI reliability

[vexxhost-bot]

Manual cherrypick required.

#1408 failed to apply on top of branch "stable/zed":

Applying: Add linters and fix dependencies
Applying: Wait for Keycloak to avoid failing if its already ready
Using index info to reconstruct a base tree...
M	roles/kube_prometheus_stack/tasks/main.yml
Falling back to patching base and 3-way merge...
Auto-merging roles/kube_prometheus_stack/tasks/main.yml
CONFLICT (content): Merge conflict in roles/kube_prometheus_stack/tasks/main.yml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0002 Wait for Keycloak to avoid failing if its already ready
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".