Dockerfile: Don't use -onbuild because we want npm install --production
Dockerfile: Don't use -onbuild because we want npm install --production

Refs https://github.com/docker-library/node/issues/14
techkrish/bootlint,kkirsche/bootlint,chrismbarr/bootlint,2947721120/ubiquitous-octo-kumquat,2947721120/ubiquitous-octo-kumquat,chrismbarr/bootlint,iamphill/bootlint,freezy-sk/bootlint,cnbin/bootlint,fellipecouto96/bootlint,twbs/bootlint,freezy-sk/bootlint,freezy-sk/bootlint,evilemon/bootlint,techkrish/bootlint,evilemon/bootlint,iamphill/bootlint,kkirsche/bootlint,angeliaz/bootlint,zacechola/bootlint,2947721120/ubiquitous-octo-kumquat,fellipecouto96/bootlint,iamphill/bootlint,evilemon/bootlint,angeliaz/bootlint,zacechola/bootlint,angeliaz/bootlint,cnbin/bootlint,techkrish/bootlint,chrismbarr/bootlint,fellipecouto96/bootlint,kkirsche/bootlint,twbs/bootlint,cnbin/bootlint,zacechola/bootlint