Use ec2.assume_role (#1336)

DEVPROD-5197

Author: katcharov

.evergreen/.evg.yml

@@ -111,6 +111,9 @@ functions:
           ${PROJECT_DIRECTORY}/${file}
 
   "upload mo artifacts":
+    - command: ec2.assume_role
+      params:
+        role_arn: ${UPLOAD_MO_ARTIFACTS_ROLE_ARN}
     - command: shell.exec
       params:
         shell: bash
@@ -119,8 +122,9 @@ functions:
           find $MONGO_ORCHESTRATION_HOME -name \*.log | xargs tar czf mongodb-logs.tar.gz
     - command: s3.put
       params:
-        aws_key: ${aws_key}
-        aws_secret: ${aws_secret}
+        aws_key: ${AWS_ACCESS_KEY_ID}
+        aws_secret: ${AWS_SECRET_ACCESS_KEY}
+        aws_session_token: ${AWS_SESSION_TOKEN}
         local_file: mongodb-logs.tar.gz
         remote_file: ${UPLOAD_BUCKET}/${build_variant}/${revision}/${version_id}/${build_id}/logs/${task_id}-${execution}-mongodb-logs.tar.gz
         bucket: mciuploads
@@ -129,8 +133,9 @@ functions:
         display_name: "mongodb-logs.tar.gz"
     - command: s3.put
       params:
-        aws_key: ${aws_key}
-        aws_secret: ${aws_secret}
+        aws_key: ${AWS_ACCESS_KEY_ID}
+        aws_secret: ${AWS_SECRET_ACCESS_KEY}
+        aws_session_token: ${AWS_SESSION_TOKEN}
         local_file: drivers-tools/.evergreen/orchestration/server.log
         remote_file: ${UPLOAD_BUCKET}/${build_variant}/${revision}/${version_id}/${build_id}/logs/${task_id}-${execution}-orchestration.log
         bucket: mciuploads