add additional CRD CEL String length validations

Author: ThoSap

operator/src/main/java/it/aboutbits/postgresql/core/ClusterReference.java

@@ -13,7 +13,7 @@
 public class ClusterReference {
     @Required
     @ValidationRule(
-            value = "self.size() > 0",
+            value = "self.trim().size() > 0",
             message = "The ClusterReference name must not be empty."
     )
     private String name = "";

operator/src/main/java/it/aboutbits/postgresql/core/SecretRef.java

@@ -13,7 +13,7 @@
 public class SecretRef {
     @Required
     @ValidationRule(
-            value = "self.size() > 0",
+            value = "self.trim().size() > 0",
             message = "The SecretRef name must not be empty."
     )
     private String name = "";

operator/src/main/java/it/aboutbits/postgresql/crd/clusterconnection/ClusterConnectionSpec.java

@@ -18,7 +18,7 @@
 public class ClusterConnectionSpec {
     @Required
     @ValidationRule(
-            value = "self.size() > 0",
+            value = "self.trim().size() > 0",
             message = "The ClusterConnection host must not be empty."
     )
     private String host = "";
@@ -30,7 +30,7 @@ public class ClusterConnectionSpec {
 
     @Required
     @ValidationRule(
-            value = "self.size() > 0",
+            value = "self.trim().size() > 0",
             message = "The ClusterConnection database must not be empty."
     )
     private String database = "postgres";

operator/src/main/java/it/aboutbits/postgresql/crd/database/DatabaseSpec.java

@@ -22,7 +22,7 @@ public class DatabaseSpec {
             message = "The Database name is immutable. Allowing to rename the Database name using 'alter database <old_name> rename to <new_name>' would add unwanted side-effects to the Operator."
     )
     @ValidationRule(
-            value = "self.size() > 0",
+            value = "self.trim().size() > 0",
             message = "The Database name must not be empty."
     )
     private String name = "";

operator/src/main/java/it/aboutbits/postgresql/crd/role/RoleSpec.java

@@ -27,7 +27,7 @@ public class RoleSpec {
             message = "The Role name is immutable. Allowing to rename the Role name using 'alter role <old_name> rename to <new_name>' would add unwanted side-effects to the Operator."
     )
     @ValidationRule(
-            value = "self.size() > 0",
+            value = "self.trim().size() > 0",
             message = "The Role name must not be empty."
     )
     private String name = "";

operator/src/main/java/it/aboutbits/postgresql/crd/schema/SchemaSpec.java

@@ -22,7 +22,7 @@ public class SchemaSpec {
             message = "The Schema name is immutable. Allowing to rename the Schema name using 'alter schema <old_name> rename to <new_name>' would add unwanted side-effects to the Operator."
     )
     @ValidationRule(
-            value = "self.size() > 0",
+            value = "self.trim().size() > 0",
             message = "The Schema name must not be empty."
     )
     private String name = "";