setup apt source location.

[sugy]

Hi @pyama86

Fixed the setting of the stns apt repository.
ref. https://github.com/STNS/package/blob/master/assets/scripts/apt-repo.sh#L14-L15

The following is the content of the file when applied to Jammy and Focal.

jammy

root@fdc354e081a4:/# cat /etc/apt/sources.list.d/stns.list
# This file is managed by Puppet. DO NOT EDIT.
# stns
deb http://repo.stns.jp/jammy/ stns jammy

focal

root@bb63427151f3:/# cat /etc/apt/sources.list.d/stns.list
# This file is managed by Puppet. DO NOT EDIT.
# stns
deb http://repo.stns.jp/focal/ stns focal