Allow specifying a host on which to listen even with SSL

Allow specifying a host on which to listen even with SSL
Grab the IP address from the HOST environment variable and use it to bind the SSL server.
Default to 0.0.0.0
IPv6 compliant.

services/ssl-server.js

@@ -1,3 +1,5 @@
+const host = process.env.HOST || '0.0.0.0';
+
 const fs = require('fs');
 const util = require('util');
 const https = require('https');
@@ -38,7 +40,7 @@ const startSSLServer = (app) => {
         key: fs.readFileSync(httpsCerts.private),
         cert: fs.readFileSync(httpsCerts.public),
       }, app);
-      httpsServer.listen(SSLPort, () => { printSuccess(); });
+      httpsServer.listen(SSLPort, host, () => { printSuccess(); });
     }
   });
 };