Allow to specify server port via environment variable.
Allow to specify server port via environment variable.

SiTLar/freefeed-server,FreeFeed/freefeed-server,golozubov/freefeed-server,FreeFeed/freefeed-server,golozubov/freefeed-server,pepyatka/pepyatka-server,SiTLar/freefeed-server,davidmz/pepyatka-server