update proxy user each time data-system is started
update proxy user each time data-system is started

frankrousseau/cozy-data-system,nono/cozy-data-system,Gara64/cozy-data-system,poupotte/cozy-data-system,aenario/cozy-data-system,cozy/cozy-data-system,cylwin/cozy-data-system,clochix/cozy-data-system,jsilvestre/cozy-data-system