Create a discourse cookbook that can be wrapped

It makes it possible to serve multiple Discord instances to different
hosts from a single nginx load balancer

Right now we run one for Kosmos and one for remoteStorage

site-cookbooks/discourse/recipes/nginx.rb

@@ -0,0 +1,39 @@
+#
+# Cookbook:: discourse
+# Recipe:: nginx
+#
+
+include_recipe "kosmos-nginx"
+
+domain = node['discourse']['domain']
+discourse_role = node['discourse']['role']
+
+upstream_ip_addresses = []
+search(:node, "role:#{discourse_role}").each do |n|
+  upstream_ip_addresses << n["knife_zero"]["host"]
+end
+# No Discourse host, stop here
+if upstream_ip_addresses.empty?
+  Chef::Log.warn("No server with '#{discourse_role}' role. Stopping here.")
+  return
+end
+
+nginx_certbot_site domain
+
+template "#{node['nginx']['dir']}/sites-available/#{domain}" do
+  source "nginx_conf.erb"
+  owner 'www-data'
+  mode 0640
+  variables server_name:           domain,
+            ssl_cert:              "/etc/letsencrypt/live/#{domain}/fullchain.pem",
+            ssl_key:               "/etc/letsencrypt/live/#{domain}/privkey.pem",
+            upstream_port:         node['discourse']['port'],
+            upstream_name:         discourse_role,
+            upstream_ip_addresses: upstream_ip_addresses
+
+  notifies :reload, 'service[nginx]', :delayed
+end
+
+nginx_site domain do
+  action :enable
+end