Add configs and instructions for deploying to Heroku

[ianrandmckenzie]

Hello again!

I wanted to make a separate service for Minecrafters, and in that process, I added some Heroku configs for myself. I thought I'd add the Heroku-specific work to your repository in case people may want to spin up a quick Heroku app on their own. A live Heroku example of this branch can be found here:

https://log4shell-heroku-example.herokuapp.com/

I plan on taking this app down once this PR is rejected/merged.

Cheers,

Ian

[kiyell]

@ianrandmckenzie

So I tried this configuration and followed the instructions and was able to spin up a Heroku app. However, although the web service appears to work, it doesn't look like the LDAP port is open. For example I tested this with curl:

curl "ldap://herokuinstance.herokuapp.com:1389" doesn't work
curl "ldap://log4shell.huntress.com:1389" works

Researching this further, it appears that Heroku doesn't allow you to open non http standard ports and use binary protocols like LDAP (https://stackoverflow.com/questions/6063731/ldap-server-on-heroku)

[ianrandmckenzie]

@kiyell Thanks for catching that! It looks like you're right, re: Heroku not supporting the ldap protocol. Unless someone has a workaround, I'm going to close this.