Ref. infra/sysadm-environment#4658

This avoids keeping around a useless shell process, and allows killing
the "init" process to always DTRT

Ref. infra/sysadm-environment#4658

Related to infra/sysadm-environment#4606

The fossology license indexer requires the fossology-nomossa package.

As a pre-requisite, it was ported from the buster package:
```
root@pergamon:.../repository# reprepro copy bullseye-swh buster-swh fossology-nomossa
Exporting indices...
root@pergamon:.../repository# reprepro ls fossology-nomossa | grep bull
fossology-nomossa | 3.1-1~bpo10~swh+1 | bullseye-swh | amd64
```

Related to T4540

Use swh without any hard-coded path

Related to T4540

Related to T4540

Related to T4540

Related to T4540