More AWS cred testing

Author: NoahStapp

.evergreen/config.yml

@@ -778,9 +778,9 @@ functions:
         working_dir: "src"
         shell: bash
         script: |
-          export AWS_ROLE_ARN=${iam_auth_assume_web_role_name}
-          export AWS_ACCESS_KEY_ID=${iam_auth_ecs_account}
-          export AWS_SECRET_ACCESS_KEY=${iam_auth_ecs_secret_access_key}
+          export AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID}
+          export AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY}
+          export AWS_SESSION_TOKEN=${AWS_SESSION_TOKEN}
 
           ${PREPARE_SHELL}
           bash ${PROJECT_DIRECTORY}/.evergreen/tox.sh ${PYTHON_BINARY} -m aws-secrets