moving ARG to place where they are first used to get better docker la…

[giedriusramas]

Moving ARG to the places where they are first used to get better Docker layer reuse. Putting ARG at top of Dockerfile prevent layer re-use.

[ventz]

@giedriusramas Could you please open PR against: https://github.com/harvard-itsecurity/docker-misp/

This repo here is just a read-only clone copy of that repo. All of the development is done there.

Also, could you leave a text comment on top, with - even though they are listed in the README, it would be convenient for someone to see them all in one place.

# User supplied inputs - (see bellow within Dockerfile for real ARGS that you can replace)
# // DO NOT TOUCH HERE - THIS SECTION IS NOT USED - SIMPLY USED AS README //
##################################################################
# ARG MYSQL_MISP_PASSWORD=ChangeThisDefaultPassworda9564ebc3289b7a14551baf8ad5ec60a	
# ARG POSTFIX_RELAY_HOST=localhost	
# ARG MISP_FQDN=localhost	
# ARG MISP_EMAIL=admin@localhost	
# ARG MISP_GPG_PASSWORD=ChangeThisDefaultPasswordXuJBao5Q2bps89LWFqWkKgDZwAFpNHvc
##################################################################
# ^^^ DO NOT TOUCH HERE - THIS SECTION IS NOT USED - SIMPLY USED AS README ^^^