fix(rabbitmq-lambda): align secret name and add password length note

- Change MQAccess to MQaccess in template.yaml to match README instructions
- Add note about 12-250 char password requirement in README

Fixes #2658

Author: julianwood

rabbitmq-lambda/README.md

@@ -15,7 +15,7 @@ Important: this application uses various AWS services and there are costs associ
 
 ## Deployment Instructions
 
-1. Set up your username and password for RabbitMQ access. In a new terminal window enter:
+1. Set up your username and password for RabbitMQ access. The password must be at least 12 characters long (maximum 250 characters). In a new terminal window enter:
     ```
     aws secretsmanager create-secret --name MQaccess --secret-string '{"username": "your-username", "password": "your-password"}'
     ```

rabbitmq-lambda/template.yaml

@@ -14,8 +14,8 @@ Resources:
       HostInstanceType: mq.m5.large
       PubliclyAccessible: true
       Users:
-        - Password: '{{resolve:secretsmanager:MQAccess:SecretString:password}}'
-          Username: '{{resolve:secretsmanager:MQAccess:SecretString:username}}'
+        - Password: '{{resolve:secretsmanager:MQaccess:SecretString:password}}'
+          Username: '{{resolve:secretsmanager:MQaccess:SecretString:username}}'
 
   MQConsumer:
     Type: AWS::Serverless::Function