BUG: cannot pass override with `null` value

[kpouget]

When I create this job

apiVersion: fournos.dev/v1
kind: FournosJob
metadata:
  name: forge-skeleton-20260702-110225
  namespace: psap-automation
  labels:
    ci-run: pr107_b2072636803294171136
spec:
  owner: kpouget
  displayName: skeleton collect_cluster_info
  cluster: psap-mgmt
  exclusive: True
  pipeline: forge-test-only
  
  executionEngine:
    forge:
      project: skeleton
      args:
        - collect_cluster_info
      configOverrides:
        caliper.export.backend.mlflow.config.workspace: null
  env:
    PULL_PULL_SHA: 9c085aa0cc6b95c08a87dd87299040b708a89859

the fjob quickly becomes

  executionEngine:
    forge:
      args:
      - collect_cluster_info
      configOverrides: {}
      project: skeleton

--> the configOverrides values disappears

[kpouget]

I double checked, I don't think that it's Forge resolved that removes it,
I logged the fjob right when it's received, and the field isn't there
https://gcsweb-ci.apps.ci.l2s4.p1.openshiftapps.com/gcs/test-platform-results/pr-logs/pull/openshift-psap_forge/107/pull-ci-openshift-psap-forge-main-fournos/2072641323545923584/artifacts/fournos/fournos/artifacts/task_logs/forge-skeleton-20260702-112016-resolve-knk77.log