Cannot deploy MCPRegistry from git in OpenShift

[dmartinol]

Fetch of registry data fails in OpenShift when the data source is pulled from git.

Registry spec:

spec:
  displayName: thv-registry
  enforceServers: false
  source:
    format: toolhive
    git:
      branch: main
      path: pkg/registry/data/registry.json
      repository: https://github.com/stacklok/toolhive
    type: git
  syncPolicy:
    interval: 5m

Error in registry status

status:
  apiStatus:
    message: Registry API deployment is not ready yet
    phase: Deploying
  conditions:
  - lastTransitionTime: "2025-10-17T18:28:37Z"
    message: 'Fetch failed: failed to create temporary directory: mkdir /tmp/mcpregistry-git-1447472569:
      read-only file system'
    reason: FetchFailed
    status: "False"
    type: SyncSuccessful