I noticed that the Cuirass remote worker in my channel-building VM only builds
things with 1 core, despite me having configured Guix to use multiple cores per
build.
# Reproduction instructions
On a multi-core QEMU VM running Guix System with a Cuirass setup, run the
following command:
```
cuirass remote-worker -w 1
```
This will result in the message "starting 1 workers (parallelism: 1 cores)".
# Expected output
The remote worker tries to build with the number of cores specified in
guix-daemon's --cores. That, or $(nproc).
It should be noted that my bare-metal foreign distro install correctly selects
$(nproc)-core parallelism. However, I have created multiple QEMU VMs running
Guix System, and they all reproduce this bug.
# Appendix
## channels.scm
```
(list (channel
(name 'guix)
(url "https://git.savannah.gnu.org/git/guix.git";)
(branch "master")
(commit
"577fd21122ca50ab7594be9adf0c5c06d5b26678")
(introduction
(make-channel-introduction
"9edb3f66fd807b096b48283debdcddccfea34bad"
(openpgp-fingerprint
"BBB0 2DDF 2CEA F6A8 0D1D E643 A2A0 6DF2 A33A 54FA")))))
```
## repro script
```
cd "$(dirname "$0")" | exit
guix time-machine -C ./channels.scm -- shell cuirass -- sh -c 'sudo $(which
cuirass) remote-server --no-publish -c /tmp/cuirass-cache & sudo $(which
cuirass) remote-worker -w 1'
```
