Mount known_hosts from home directory for using ssh-agent on self-hosted runner

[chromee]

When using self-hosted runner, name of the user running runner is not necessarily the runner. So known_hosts need to be mounted from .ssh folder in home directory of user running self-hosted runner.

helped by @nikaera

Changes

• mount .ssh/known_hosts from the running user's home directory

Checklist

• [x] Read the contribution guide and accept the code of conduct
• [x] Readme (updated or not needed)
• [x] Tests (added, updated or not needed)

[github-actions[bot]]

[webbertakken]

Does the project get checked out in that home dir as well?

Should we be updating all occurrences of that directory?

[chromee]

When installing the self hosted runner, specify a working directory for the runner. The project will be checked out to that working directory.

Yes, we should update where assuming GitHub runners.

[webbertakken]

I lost context. What is the status of this PR?

[chromee]

Sorry for the late reply. I found further improvements and will re-submit a PR. So I close this PR.