Throwing set -a and set +a around a variable pair list

[stuartpb]

set -a makes it so that every assignment has an implicit export in front of it. set +a turns this off.

This makes it really easy to keep configuration in a file like this (which is compatible with Docker's --env option and EnvironmentFile in systemd):

SECRET_BASE=qweasd4321
SPECIAL_KEY=ghfdwqu98

and then export its variables (eg. setting up an environment for a script):

set -a; . config_file; set +a

[progrium]

More of a pro-tip than a style issue. These really aren't actionable for me, but I do encourage you to start a guide or something.

[stuartpb]

Yeah, this was the tip I was thinking of in #20 (comment)