configurable container capabilities (#1336)

* configurable container capabilities

* revert change on TestTLS

* fix e2e test

* minor fix

manifests/configmap.yaml

@@ -3,6 +3,7 @@ kind: ConfigMap
 metadata:
   name: postgres-operator
 data:
+  # additional_pod_capabilities: "SYS_NICE"
   # additional_secret_mount: "some-secret-name"
   # additional_secret_mount_path: "/some/dir"
   api_port: "8080"

manifests/operatorconfiguration.crd.yaml

@@ -126,6 +126,10 @@ spec:
               kubernetes:
                 type: object
                 properties:
+                  additional_pod_capabilities:
+                    type: array
+                    items:
+                      type: string
                   cluster_domain:
                     type: string
                     default: "cluster.local"

manifests/postgresql-operator-default-configuration.yaml

@@ -26,6 +26,8 @@ configuration:
     replication_username: standby
     super_username: postgres
   kubernetes:
+    # additional_pod_capabilities:
+    # - "SYS_NICE"
     cluster_domain: cluster.local
     cluster_labels:
       application: spilo