[codesprints] Changes to the dev container behavior

[Robert Sparks <[e-mail]>]

All -

If you happen to be working with main right now, we have some changes 
that are in-flux that will affect your workflow.

At the moment:

1) When you build containers, if the app container sees a an 
ietf/settings_local.py  it will rename it to ietf/settings_local.py.bak 
and then copy the baseline settings_local out of the /docker directory 
into ietf/settings_local.py. If you are working on things that require 
changes to settings_local, you'll need to copy the .bak file back into 
place after the app container builds. We made this change since _most_ 
developers are never touching settings_local.py and it makes it more 
likely that they'll get a valid build as the dev container needs change.

2) We have put an nginx instance into the app container that dispatches 
requests to statics or to wherever you are running runserver. We're 
playing some port-shuffle games, but right now, nginx will consume port 
8000 (so that systems that automap will try to automap it to 8000 on the 
host) and it reverse-proxies to runserver expecting to find it on 8001. 
That is, when you run runserver, you should give it an argument port of 
8001.

I'll send more as we refine these changes.

RjS