Environment var for UPLOAD_FOLDER (#314)
Environment var for UPLOAD_FOLDER (#314)

It would be helpful to have the option to set the UPLOAD_FOLDER via environment variable. This change allows that.
CTFd/CTFd,ajvpot/CTFd,CTFd/CTFd,LosFuzzys/CTFd,isislab/CTFd,LosFuzzys/CTFd,isislab/CTFd,isislab/CTFd,CTFd/CTFd,CTFd/CTFd,ajvpot/CTFd,isislab/CTFd,LosFuzzys/CTFd,ajvpot/CTFd,ajvpot/CTFd,LosFuzzys/CTFd