wrong signature:
minisign -Vm <ISO file> -P RWTclGe42GmvIX/xnNiXdigNll7NSfpYGl1rj+sEERcLgoEsse5EwAgA
right signature:
minisign -Vm <ISO file> -P RWSYD67kyKkhed0+Kyu3YFVYFMmbDJGgTSIZgoPUsNNlwXvFFj7PjqEc
as https://raw.githubusercontent.com/vyos/vyos-rolling-nightly-builds/main/minisign.pub file contents