Support Reverse Proxy Email

[MTecknology]

• Gitea version (or commit ref): master
• Git version: 2.11.0
• Operating system: Debian
• Database (use [x]):
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• Can you reproduce the bug at https://try.gitea.io:
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Description

The option REVERSE_PROXY_AUTHENTICATION_USER option allows users to be created, which is great, but I noticed the email address tends to look something like this, c8147db3-4a42-a6b3-8642-d7c33fc55365@localhost. I'm not sure where that value comes from, but I'm pretty confident it's relatively useless.

When the proxy is providing authentication information, I imagine the user's email address is readily available to the proxy. In this case, it would be helpful if the option REVERSE_PROXY_AUTHENTICATION_EMAIL could be added so that the value can be correctly filled out during registration.

It'd also be nice if there were an option to automatically update the address if it changes.

[lafriks]

Other option would be to define email domain and have emails generated in form username@domain

[MTecknology]

We already have two domains that might be used and potentially more.