Ensure rofiles-fuse gets SIGTERM if we exit

[cgwalters]

I've seen us leak fuse processes on the build side; I think this happens when we get SIGINT (ctrl-c). Ensure that in this case the fuse process gets SIGTERM, so it can gracefully unmount itself.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[cgwalters]

/retest

[jlebon]

Nice!