Loki environment for Tanka is empty, cannot install

Hi,

I’m following this guide to install Loki using Tanka but there are no environment variables to modify.

johan:~/loki$ cat environments/loki/main.jsonnet
{}
johan:~/loki$
johan:~/loki$ ls -lathr
total 28K
drwxr-xr-x  2 johan johan 4.0K Jun  7 14:42 lib
drwxr-xr-x  5 johan johan 4.0K Jun  7 14:42 .
drwxr-xr-x  4 johan johan 4.0K Jun  7 14:42 environments
drwxr-xr-x  3 johan johan 4.0K Jun  7 14:42 vendor
-rw-r--r--  1 johan johan 2.4K Jun  7 14:42 jsonnetfile.lock.json
-rw-r--r--  1 johan johan 1.1K Jun  7 14:42 jsonnetfile.json
drwxr-x--- 17 johan johan 4.0K Jun  7 14:43 ..
johan:~/loki$
johan:~/loki$ jb --version
v0.5.1
johan:~/loki$ tk --version
2023/06/07 14:47:26 tk version v0.25.0
johan:~/loki$

Any suggestions how to fix this issue?

Regards Johan