Add swtpm_setup command

[eljojo]

Hello, amazing work done here!
I noticed I can't initialize VMs with Windows, due to missing swtpm_setup tool:

TASK ERROR: start failed: command 'swtpm_setup --tpmstate file:///dev/zvol/one_tera/vm-101-disk-1 --createek --create-ek-cert --create-platform-cert --lock-nvram --config /etc/swtpm_setup.conf --runas 0 --not-overwrite --tpm2 --ecc' failed: open3: exec of swtpm_setup --tpmstate file:///dev/zvol/one_tera/vm-101-disk-1 --createek --create-ek-cert --create-platform-cert --lock-nvram --config /etc/swtpm_setup.conf --runas 0 --not-overwrite --tpm2 --ecc failed: No such file or directory at /nix/store/1138wihmibq5bndqa10cman77jgwqq65-perl-5.38.2-env/lib/perl5/site_perl/5.38.2/PVE/Tools.pm line 494.

I imagine it has to be added to one of the build environments?

[eljojo]

I have a working proof of concept here main...eljojo:proxmox-nixos:swtpm

[eljojo]

I see #111 addresses this