Reuse Github Actions self hosted runner on multiple repositories

For those that want to know what I did to fix this problem. I installed multiple GitHub runners on my server with different names. Not the best solution, but the only thing thats possible now without a dirty workaround...

Update:

This is possible as of 22nd of April 2020. You can now share runners across an organization. This allows for repositories within your organization to use those runners.

https://github.blog/2020-04-22-github-actions-community-momentum-enterprise-capabilities-and-developer-improvements/#share-self-hosted-runners-across-an-organization

Old Answer:

This is not possible as of yet, according to a Github Partner:

Currently, we have no methods to use the self-hosted runners across repositories, and also have no options to added self-hosted runners on Organization level.

Source: https://github.community/t5/GitHub-Actions/Can-one-Github-Actions-self-hosted-runner-work-for-multiple/td-p/41465