clean up apt-cache in webui/Dockerfile
clean up apt-cache in webui/Dockerfile

mvdstam/traefik,dtomcej/traefik,timoreimann/traefik,mihaitodor/traefik,mmatur/traefik,nmengin/traefik,atbore-phx/traefik,martinbaillie/traefik,aantono/traefik,SantoDE/traefik,seryl/traefik,mmatur/traefik,aantono/traefik,ldez/traefik,dtomcej/traefik,mvdstam/traefik,FriggaHel/traefik,Regner/traefik,bparli/traefik,marco-jantke/traefik,simbas/traefik,atbore-phx/traefik,ldez/traefik,kekoav/traefik,simbas/traefik,vholovko/traefik,martinbaillie/traefik,mvdstam/traefik,dtomcej/traefik,EmileVauge/traefik,marco-jantke/traefik,marco-jantke/traefik,vdemeester/traefik,kekoav/traefik,mvdstam/traefik,mmatur/traefik,ldez/traefik,containous/traefik,kekoav/traefik,thomasbach76/traefik,jangie/traefik,vdemeester/traefik,tanyadegurechaff/traefik,atbore-phx/traefik,timoreimann/traefik,FriggaHel/traefik,mihaitodor/traefik,ldez/traefik,mihaitodor/traefik,bparli/traefik,FriggaHel/traefik,FriggaHel/traefik,containous/traefik,mildis/traefik,thomasbach76/traefik,seryl/traefik,mmatur/traefik,mihaitodor/traefik,thomasbach76/traefik,SantoDE/traefik,EmileVauge/traefik,tanyadegurechaff/traefik,marco-jantke/traefik,jangie/traefik,nmengin/traefik,vholovko/traefik,Regner/traefik,containous/traefik,bparli/traefik,adityacs/traefik,thomasbach76/traefik,EmileVauge/traefik,nmengin/traefik,tanyadegurechaff/traefik,vholovko/traefik,adityacs/traefik,SantoDE/traefik,simbas/traefik,aantono/traefik,containous/traefik,nmengin/traefik,adityacs/traefik,dtomcej/traefik,tanyadegurechaff/traefik,EmileVauge/traefik,jangie/traefik,aantono/traefik,simbas/traefik,martinbaillie/traefik,Regner/traefik,mildis/traefik,vdemeester/traefik,vdemeester/traefik,timoreimann/traefik,vholovko/traefik,aantono/traefik,kekoav/traefik,jangie/traefik,martinbaillie/traefik,mildis/traefik,bparli/traefik,adityacs/traefik,seryl/traefik,atbore-phx/traefik,mildis/traefik,timoreimann/traefik,seryl/traefik,SantoDE/traefik,Regner/traefik