optimized CFN template

removed mappings and added SSM Parameter as this will dynamically allow for the latest ecs-optimized-ami each time. 

      - /aws/service/ecs/optimized-ami/amazon-linux-2/gpu/recommended/image_id
      - /aws/service/ecs/optimized-ami/amazon-linux-2/arm64/recommended/image_id
      - /aws/service/ecs/optimized-ami/amazon-linux-2/recommended/image_id
      - /aws/service/ecs/optimized-ami/amazon-linux/recommended/image_id

Note: 
Your user account must have the following IAM permissions to retrieve the Amazon ECS-optimized AMI metadata. These permissions have been added to the AmazonECS_FullAccess IAM policy.
    ssm:GetParameters
    ssm:GetParameter
    ssm:GetParametersByPath

Author: Seblat5ch

templates/ecs-cluster.yaml

@@ -27,45 +27,19 @@ Parameters:
   VpcId:
     Type: AWS::EC2::VPC::Id
 
+  ECSOptimizedImage:
+    Description: ECS-Optimized AMI ID
+    Type: AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>
+    Default: /aws/service/ecs/optimized-ami/amazon-linux/recommended/image_id
+    AllowedValues: 
+      - /aws/service/ecs/optimized-ami/amazon-linux-2/gpu/recommended/image_id
+      - /aws/service/ecs/optimized-ami/amazon-linux-2/arm64/recommended/image_id
+      - /aws/service/ecs/optimized-ami/amazon-linux-2/recommended/image_id
+      - /aws/service/ecs/optimized-ami/amazon-linux/recommended/image_id
 
 Conditions:
   EC2: !Equals [ !Ref LaunchType, "EC2" ]
 
-
-Mappings:
-  AWSRegionToAMI:
-    ap-south-1:
-      AMI: ami-00491f6f
-    eu-west-3:
-      AMI: ami-9aef59e7
-    eu-west-2:
-      AMI: ami-67cbd003
-    eu-west-1:
-      AMI: ami-1d46df64
-    ap-northeast-2:
-      AMI: ami-c212b2ac
-    ap-northeast-1:
-      AMI: ami-872c4ae1
-    sa-east-1:
-      AMI: ami-af521fc3
-    ca-central-1:
-      AMI: ami-435bde27
-    ap-southeast-1:
-      AMI: ami-910d72ed
-    ap-southeast-2:
-      AMI: ami-58bb443a
-    eu-central-1:
-      AMI: ami-509a053f
-    us-east-1:
-      AMI: ami-28456852
-    us-east-2:
-      AMI: ami-ce1c36ab
-    us-west-1:
-      AMI: ami-74262414
-    us-west-2:
-      AMI: ami-decc7fa6
-
-
 Resources:
   ECSRole:
     Type: AWS::IAM::Role
@@ -160,7 +134,7 @@ Resources:
                   - /etc/cfn/cfn-hup.conf
                   - /etc/cfn/hooks.d/cfn-auto-reloader.conf
     Properties:
-      ImageId: !FindInMap [ AWSRegionToAMI, !Ref "AWS::Region", AMI ]
+      ImageId: !Ref ECSOptimizedImage
       InstanceType: !Ref InstanceType
       IamInstanceProfile: !Ref InstanceProfile
       SecurityGroups: