Fix build for restrictive UMASK on host Building a database image failed due to insufficient permissions for the postgres user to read and execute files transfered with COPY from the host if these files did not have the necessary file modes set for all users, because files are owned by root by default.

teichmann@intevation.de = sascha.teichmann@intevation.de
bernhard.reiter@intevation.de = bernhard@intevation.de