[Bugfix] Resize header buffer for keycloak nginx ingress

[ctiml]

Signed-off-by: Timothy Lee ctiml@infuseai.io

PR checklist

• [x] Ensure you have added or ran the appropriate tests for your PR.
• [x] DCO signed

What type of PR is this? Bugfix

What this PR does / why we need it: Prevent HTTP 599 status from sending a request with a large token