[fix] Debian package: ensure failure is caught (#7804)
[fix] Debian package: ensure failure is caught (#7804)

fakeroot was missing from the Docker image.
NiLuJe/koreader,Frenzie/koreader,Frenzie/koreader,poire-z/koreader,koreader/koreader,poire-z/koreader,koreader/koreader,NiLuJe/koreader