Bad idea from the start. Anything you make on company equipment belongs to the company. You signed and approved that. Changing that only opens up liability for the company and so even if they do approve it it will be worded against you. If you push anyway to the open source project then that opens the door for your company to attempt to claim ownership too. All around it's a lose lose situation for you, and the project.
Coding does not require a supercomputer. Go pick up a used laptop somewhere and do the work off of that.