chore: add proper permissions to pull official powertools layer (aws-samples#42)

Author: Tom McCarthy

amplify-ci/amplify-template.yaml

@@ -63,6 +63,12 @@ Resources:
                 Resource: 
                   - !Sub "arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:*"
                   - !Sub "arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:layer:*"
+              -
+                Effect: Allow
+                Action:
+                  - lambda:GetLayerVersion
+                Resource:
+                  - !Sub "arn:aws:lambda:${AWS::Region}:017000801446:layer:AWSLambdaPowertoolsPython*"
               -
                 Effect: Allow
                 Action: