Support SSL on non-standard ports

[ankitrgadiya]

Currently, WriteFreely only supports SSL on 443 port. The server checks if the port is 443 and only then it enables the SSL Relevant code: https://github.com/writeas/writefreely/blob/dfa14c9c92937e9806327f97847e4b9440f3b7be/config/config.go#L214-L216

I would like WriteFreely to support SSL on non-standard (ports out of 1-1000 range). This is because the 1-1000 port range requires root privilege to be bound, thus preventing Docker installations to use non-root users. I propose a new configuration variable for SSL and modify the IsSecureStandalone function to check that variable. Then, the supplied port won't matter. It should be a small change but does modify the configuration format.

I'd be happy to take this up 😀.

[ankitrgadiya]

It appears that when SSL is enabled, WriteFreely also binds to port 80 and create a redirect. That also is definitely a problem for non-privileged containers. Open for suggestions on how to take care of that.