Update CFN to enforce validation for non-capital env name

Author: Murielxun

recipes/res/res_demo_env/assets/bi.yaml

@@ -35,9 +35,9 @@ Parameters:
     Type: String
     Default: ""
   EnvironmentName:
-    Description: (Optional) EnvironmentName must start with "res-"and should be less than or equal to 11 characters. Required to generate certificates.
+    Description: (Optional) EnvironmentName must start with "res-" without capital letters and should be less than or equal to 11 characters. Required to generate certificates.
     Type: String
-    AllowedPattern: ^$|^res-[A-Za-z\-\_0-9]{0,7}$
+    AllowedPattern: ^$|^res-[a-z\-\_0-9]{0,7}$
     Default: res-demo
   AdminPassword:
     Description: (Optional) Provide the Active Directory Administrator Account Password Directly or Resource ARN to Secret Containing Password.

recipes/res/res_demo_env/assets/res-demo-stack.yaml

@@ -27,8 +27,8 @@ Parameters:
     Description: Provide name of the RES Environment. Must be unique for your account and AWS Region.
     Type: String
     Default: res-demo
-    AllowedPattern: ^res-[A-Za-z\-\_0-9]{0,7}$
-    ConstraintDescription: EnvironmentName must start with "res-" and should be less than or equal to 11 characters.
+    AllowedPattern: ^res-[a-z\-\_0-9]{0,7}$
+    ConstraintDescription: EnvironmentName must start with "res-" without capital letters and should be less than or equal to 11 characters.
 
   AdministratorEmail:
     Type: String

recipes/res/res_demo_env/assets/res-sso-keycloak.yaml

@@ -21,8 +21,8 @@ Parameters:
     Description: Provide name of the RES Environment. Must be unique for your account and AWS Region.
     Type: String
     Default: res-demo
-    AllowedPattern: ^res-[A-Za-z\-\_0-9]{0,7}$
-    ConstraintDescription: EnvironmentName must start with "res-" and should be less than or equal to 11 characters.
+    AllowedPattern: ^res-[a-z\-\_0-9]{0,7}$
+    ConstraintDescription: EnvironmentName must start with "res-" without capital letters and should be less than or equal to 11 characters.
 
   Keypair:
     Description: EC2 Keypair to access management instance.

recipes/res/res_ready_ami/assets/imagebuilder-infrastructure.yaml

@@ -18,8 +18,8 @@ Parameters:
   EnvironmentName:
     Type: String
     Description: Provide name of the RES Environment. Must be unique for your account and AWS Region.
-    AllowedPattern: ^res-[A-Za-z\-\_0-9]{0,7}$
-    ConstraintDescription: EnvironmentName must start with "res-" and should be less than or equal to 11 characters.
+    AllowedPattern: ^res-[a-z\-\_0-9]{0,7}$
+    ConstraintDescription: EnvironmentName must start with "res-" without capital letters and should be less than or equal to 11 characters.
   VPC:
     Description: VPC where RES is deployed
     Type: 'AWS::EC2::VPC::Id'