As a QE engineer, I want to validate the environment variable override works end-to-end in a real deployment, so that I can ensure the feature functions correctly in production scenarios.

Context:
Validate the environment variable override works end-to-end in a real deployment with shared ingress enabled.

Tasks:

• Deploy HyperShift operator with IMAGE_SHARED_INGRESS_HAPROXY environment variable set
• Create a HostedCluster with shared ingress enabled
• Verify shared ingress router pods use the overridden image
• Verify worker node HAProxy static pods use the overridden image
• Test cluster functionality (API server connectivity through HAProxy)

Acceptance Criteria:

• Shared ingress router deployment reflects the custom image
• Worker nodes use the custom HAProxy image
• API server remains accessible through the HAProxy proxy
• No regressions in shared ingress functionality