Recognise c7g instances as ARM

There are other new ARM instance types, but this brings us to the limit
of 10 conditions within `Fn::Or` in CloudFormation. Of the new instance
type, c7g sounds most generally useful for CI workloads, maybe.

Author: pda

templates/aws-stack.yml

@@ -582,15 +582,16 @@ Conditions:
 
     UsingArmInstances:
       !Or
-        - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "m6g" ]
-        - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "m6gd" ]
-        - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "t4g" ]
         - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "a1" ]
         - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "c6g" ]
         - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "c6gd" ]
         - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "c6gn" ]
+        - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "c7g" ]
+        - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "m6g" ]
+        - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "m6gd" ]
         - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "r6g" ]
         - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "r6gd" ]
+        - !Equals [ !Select [ 0, !Split [ ".", !Ref InstanceType ] ], "t4g" ]
 
 Mappings:
   ECRManagedPolicy: