Use circleci AWS IAM role (#553)

* Use circleci role

* remove

* remove

Author: yunfeng-scale

.circleci/config.yml

@@ -1,6 +1,7 @@
 version: 2.1
 orbs:
   python: circleci/python@2.1.1
+  aws-cli: circleci/aws-cli@3.1.5
 
 workflows:
   ci:
@@ -175,13 +176,14 @@ jobs:
             pip install -r model-engine/requirements.txt
       - install_client
       - install_server
+      - aws-cli/setup:
+          role-arn: ${CIRCLECI_ROLE_ARN}
+          aws-region: AWS_REGION
       - run:
           name: Run integration tests
           command: |
             pushd $HOME/project
             kubectl port-forward svc/model-engine 5001:80 &
-            export AWS_ACCESS_KEY_ID=$CIRCLECI_AWS_ACCESS_KEY
-            export AWS_SECRET_ACCESS_KEY=$CIRCLECI_AWS_SECRET_KEY
             export GIT_TAG=$CIRCLE_SHA1
             pytest integration_tests