Basically followed along with How To Set Up Gogs on Ubuntu 14.04.

However, installation to a Raspberry Pi B 2 running Mail In A Box requires some adjustments.

1. Get an ARM Go binary instead (version 1.6.3 suitable at time of whatever–this–is);
   

   wget https://storage.googleapis.com/golang/go1.6.3.linux-armv6l.tar.gz

2. Nginx configuration with added TLS;
   

   ./certbot-auto certonly -w /home/cn/domains/[server name] -d [server name] -a webroot

   sudoedit /etc/nginx/conf.d/gogs.conf

   server {
       listen 80;
       server_name [server name];
   
       proxy_set_header X-Real-IP  $remote_addr; # pass on real client IP
   
   	location / {
   		# Redirect using the 'return' directive and the built-in
   		# variable '$request_uri' to avoid any capturing, matching
   		# or evaluation of regular expressions.
   		return 301 https://$server_name$request_uri;
   	}
   
       location /.well-known/acme-challenge/ {
   	# This path must be served over HTTP for ACME domain validation.
   	# We map this to a special path where our TLS cert provisioning
   	# tool knows to store challenge response files.
   	root /home/cn/domains/[server name];
       }
   }
   
   # The secure HTTPS server.
   server {
   	listen 443 ssl;
   	listen [::]:443 ssl;
   
   	server_name [server name];
   
   	# Improve privacy: Hide version an OS information on
   	# error pages and in the "Server" HTTP-Header.
   	server_tokens off;
   
   	ssl_certificate /etc/letsencrypt/live/[server name]/fullchain.pem;
   	ssl_certificate_key /etc/letsencrypt/live/[server name]/privkey.pem;
   
       location / {
           proxy_pass http://localhost:3000;
       }
   
   }

3. Supervisor config without appending to the main file;
   

   sudoedit /etc/supervisor/conf.d/gogs.conf

It will be no surprise to me if I’ve missed a step that I changed.