The instruction for Fedora/RHEL doesn't work for openSUSE Tumbleweed.
In addition to the packages listed there, I had to add:
sudo zypper install libQt5DBus-devel libQt5Gui-devel qtdeclarative-imports-provides-qt5 libqt5-qtdeclarative-devel knotiffications-devel knotifications-devel kactivities5-devel karchive-devel kcoreaddons-devel kcoreaddons-devel kguiaddons-devel kcrash-devel kdbusaddons-devel kdeclarative-devel kglobalaccel-devel kirigami2-devel ki18n-devel kiconthemes-devel kio-devel knewstuff-devel plasma-framework-devel kwayland-devel plasma5-workspace-devel kitemmodels-devel libqt5-qtx11extras-devel plasma-wayland-protocols
sudo
and libqt5-qtwayland
was missing from the official docker image, too.
The final one-liner: