Add Patroni failsafe_mode parameter (#2076)

This commit adds support of a not-yet-released Patroni feature that allows postgres to run as primary in case of a failed leader lock update.
* Add Patroni 'failsafe_mode' local parameter (enable for a single PG cluster)
* Allow configuring Patroni 'failsafe_mode' parameter globally

manifests/complete-postgres-manifest.yaml

@@ -109,6 +109,7 @@ spec:
       cpu: 500m
       memory: 500Mi
   patroni:
+    failsafe_mode: false
     initdb:
       encoding: "UTF8"
       locale: "en_US.UTF-8"

manifests/configmap.yaml

@@ -47,6 +47,7 @@ data:
   enable_master_load_balancer: "false"
   enable_master_pooler_load_balancer: "false"
   enable_password_rotation: "false"
+  # enable_patroni_failsafe_mode: "false"
   enable_pgversion_env_var: "true"
   # enable_pod_antiaffinity: "false"
   # enable_pod_disruption_budget: "true"

manifests/operatorconfiguration.crd.yaml

@@ -631,6 +631,12 @@ spec:
                     type: string
                     pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
                     default: "100Mi"
+              patroni:
+                type: object
+                properties:
+                  failsafe_mode:
+                    type: boolean
+                    default: false
           status:
             type: object
             additionalProperties:

manifests/postgresql-operator-default-configuration.yaml

@@ -198,3 +198,5 @@ configuration:
     connection_pooler_number_of_instances: 2
     # connection_pooler_schema: "pooler"
     # connection_pooler_user: "pooler"
+  patroni:
+    # failsafe_mode: "false"

manifests/postgresql.crd.yaml

@@ -318,6 +318,8 @@ spec:
               patroni:
                 type: object
                 properties:
+                  failsafe_mode:
+                    type: boolean
                   initdb:
                     type: object
                     additionalProperties: