Init add liveness probe

Signed-off-by: DavidSpek <vanderspek.david@gmail.com>

docs/reference/cluster_manifest.md

@@ -85,6 +85,10 @@ These parameters are grouped directly under  the `spec` key in the manifest.
   requires a custom Spilo image. Note the FSGroup of a Pod cannot be changed
   without recreating a new Pod. Optional.
 
+* **livenessProbe**
+  Allows for adding a liveness probe to the Spilo container to detect if it's
+  running properly.
+
 * **enableMasterLoadBalancer**
   boolean flag to override the operator defaults (set by the
   `enable_master_load_balancer` parameter) to define whether to enable the load

docs/reference/operator_parameters.md

@@ -469,6 +469,10 @@ configuration they are grouped under the `kubernetes` key.
   process. Required by cron which needs setuid. Without this parameter,
   certification rotation & backups will not be done. The default is `true`.
 
+* **liveness_probe**
+  Allows for adding a liveness probe to the Spilo container to detect if it's
+  running properly.
+
 * **additional_pod_capabilities**
   list of additional capabilities to be added to the postgres container's
   SecurityContext (e.g. SYS_NICE etc.). Please, make sure first that the