Set GOMEMLIMIT from container memory limit

[fwiesel]

Without GOMEMLIMIT the Go GC is unaware of the container limit and may
let the heap grow until the kernel OOM-kills the process.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5deb0eb8-0ce5-4ec5-b037-d12216a6f910

📥 Commits

Reviewing files that changed from the base of the PR and between 441452b and 15714f5.

📒 Files selected for processing (1)

• charts/openstack-hypervisor-operator/templates/deployment.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch set-gomemlimit

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[github-actions]

Merging this branch will increase overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/cobaltcore-dev/openstack-hypervisor-operator/api/v1	0.00% (ø)
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller	69.37% (+0.39%)	👍

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/cobaltcore-dev/openstack-hypervisor-operator/api/v1/hypervisor_types.go	0.00% (ø)	0	0	0
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/constants.go	0.00% (ø)	0	0	0
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/gardener_node_lifecycle_controller.go	63.95% (-8.46%)	86 (+28)	55 (+13)	31 (+15)	👎
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/hypervisor_controller.go	81.08% (+5.41%)	111 (+37)	90 (+34)	21 (+3)	👍
github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/offboarding_controller.go	73.91% (+2.04%)	69 (+5)	51 (+5)	18	👍

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/gardener_node_lifecycle_controller_test.go
• github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/hypervisor_controller_test.go
• github.com/cobaltcore-dev/openstack-hypervisor-operator/internal/controller/offboarding_controller_test.go

[Copilot]

Pull request overview

This PR updates the Helm deployment for the controller-manager to set GOMEMLIMIT from the container’s configured memory limit so the Go GC can respect cgroup/container limits and reduce OOM-kill risk.

Changes:

• Add a GOMEMLIMIT environment variable to the controller-manager container, sourced from limits.memory via resourceFieldRef.

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