fix(infra): hardcode the Task role of the ECS streamlit task

it turns out that the parameter "TaskRole" in the template is not
being set by Copilot, so it does not resolve. Because of this,
we need to hardcode the name of the Task role.

Author: lalver1

infra/copilot/streamlit/addons/s3-marts-access-policy.yml

@@ -8,9 +8,6 @@ Parameters:
   Name:
     Type: String
     Description: Your workload's name.
-  TaskRole:
-    Type: String
-    Description: The ARN of the task role.
 
 Resources:
   S3martsBucketAccessPolicy:
@@ -19,7 +16,7 @@ Resources:
       PolicyName: s3martsBucketPolicy
       # Attach this policy to the TaskRole provided by Copilot.
       Roles:
-        - !Ref TaskRole
+        - "pems-dev-streamlit-TaskRole-5Zuwi15thMkN"
       PolicyDocument:
         Version: "2012-10-17"
         Statement: