Mount a Windows fileshare within a self-hosted runner using CIFS

[Ryan Taylor]

We've configured a linux docker self hosted runner in our environment and need to move build artifacts from the docker container to a windows file share. We do not have ssh or sftp available and cannot use those utilities at this time.

I attempted to mount the windows file share using CIFS as we do something similar on our windows containers (in Jenkins) using net use.

mount -t cifs \
  -o username=your_user,password=your_password,domain=your_domain \
  //your/file/share \
  /mnt/share

However, this does not seem possible as I am getting the following error:

Unable to apply new capability set.

How can I mount my windows file share within a self-runner linux docker container?

Update 2025/10/11: 

It appears this this may now be possible with Runtime v3 with the Privileged flag but I'm still not sure on a couple things.

1. Does this mean I am running a docker container instead a docker container?
2. Is there no way to run the "top" container in privileged mode in my own self hosted runner?

#2 with something like `privileged: true` would be beneficial as I could run multiple steps in the privileged container via the scripts property(ies) rather than encoding them in the docker run command itself (which may be rather long when I have multiple steps).

[Ryan Taylor]

It appears this this may now be possible with Runtime v3 with the Privileged flag but I'm still not sure on a couple things.

1. Does this mean I am running a docker container instead a docker container?
2. Is there no way to run the "top" container in privileged mode in my own self hosted runner?

#2 with something like `privileged: true` would be beneficial as I could run multiple steps in the privileged container via the scripts property(ies) rather than encoding them in the docker run command itself (which may be rather long when I have multiple steps).