Set GOMEMLIMIT from container memory limit

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

Author: fwiesel

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

@@ -47,6 +47,10 @@ spec:
           value: {{ quote .Values.controllerManager.manager.env.labelSelector }}
         - name: KUBERNETES_CLUSTER_DOMAIN
           value: {{ quote .Values.kubernetesClusterDomain }}
+        - name: GOMEMLIMIT
+          valueFrom:
+            resourceFieldRef:
+              resource: limits.memory
         image: {{ .Values.controllerManager.manager.image.repository }}:{{ .Chart.AppVersion }}
         livenessProbe:
           httpGet: