#BuildforCOVID19 Global Online Hackathon https://devpost.com/software/crowdy-8w1pvu How to build npm run heroku-postbuild npm start How to build dockerfile sudo docker build -t {Docker Path}:{Tag} . sudo docker push {Docker Path}:{Tag} Install docker (https://blog.cosmosfarm.com/archives/248/%EC%9A%B0%EB%B6%84%ED%88%AC-18-04-%EB%8F%84%EC%BB%A4-docker-%EC%84%A4%EC%B9%98-%EB%B0%A9%EB%B2%95/)