Uuuuuuuh, #OpenBao (the open source fork of #Hashicorp #Vault) just released version 2.2.0 and now includes the UI, that was missing so far.
The package for @opensuse was adapted, tested and worked out fine. Will soon be available in #Tumbleweed!
If you want to test this out, feel free to use this vagrant-libvirt setup of mine:
https://codeberg.org/johanneskastl/openbao_vagrant_libvirt_ansible