add check correction of installation dotnet and node

Author: LabEG

Dockerfile

@@ -15,6 +15,8 @@ RUN sh -c 'echo -e "[code]\nname=Visual Studio Code\nbaseurl=https://packages.mi
         && \
         dnf install -y geany git code falkon dotnet-sdk-6.0 nodejs gnome-system-monitor \
         && \
+        dotnet --version && node -v \
+        && \
         npm install -g typescript npm-check-updates \
         && \
         chown headless:headless -R ${HOME}