This one is about manual OST runs
We started to use this job to build artifacts for running OST.
Looks like this job is limited to one concurrent job, which make it less
it could be.
If we don't make it easy to run OST, people will not run it, and the change
Please change the limit to use the same limit used for regular builds. We
seem to be
able to create more then 10 concurrent builds by uploading patches to
gerrit. The manual
runner should this as well.