Evaluate options for big file uploads and implement

[mccalluc]

There are several options for multi-POST, big file uploads:

• https://github.com/pgaertig/nginx-big-upload
• https://github.com/vkholodkov/nginx-upload-module
• https://github.com/openresty/lua-resty-upload

Figure out what works best, install it, and figure out the client scripting needed to make it useful.

[mccalluc]

• nginx-upload-module is not working after 1.3.9.
• nginx-big-upload requires a special build of nginx, and does not support multipart (ie form) uploads
• lua-resty-upload is more flexible, but it looks like user need to code in lua to indicate how data should be processed.

... but worth noting that in each of these, nginx is not just acting as a reverse proxy, as far as I can tell: Once the file is on the server, it looks like the preferred thing is to process it in place, rather than trying to squeeze it through http again. ie, all this machinery doesn't do much more than just having a volume mounted to docker, and having a hook to trigger ingest of a given file.

[mccalluc]

If a special build is required, then I should probably step back and take another look at having separate containers for nginx and django, because I don't want to add all the steps for the nginx build to the existing Dockerfile.

[mccalluc]

Gave up on trying to do it through HTTP: CLI works.