Generating a list of paths for restic to backup introduces some issues:
- restic matches incremental backups by paths, changing paths cause new
backups
- logs and a lot of restic commands print all the paths, which makes it
basically unusable
Thus I've reverted to using static `paths` and excluding patterns via
the `--exclude-file` argument.
To reduce files to backup from `~/dev`, a preStart job was added to the
systemd service: It clones the directory via `rsync` with `.gitignore`
files being respected.