Make gRPC server host configurable in the configuration

Author: Knerio

config/sagittarius.example.yml

@@ -4,6 +4,8 @@ rails:
   web:
     port: 3000
     force_ssl:
+  grpc:
+    host: '0.0.0.0:50051'
   db:
     host: localhost
     port: 5433

lib/sagittarius/configuration.rb

@@ -25,6 +25,9 @@ def self.defaults
             port: 3000,
             force_ssl: nil,
           },
+          grpc: {
+            host: '0.0.0.0:50051',
+          },
           log_level: 'info',
           db: {
             host: 'localhost',

lib/sagittarius/grpc/launcher.rb

@@ -5,7 +5,7 @@ module Grpc
     class Launcher
       include Code0::ZeroTrack::Loggable
 
-      HOST = '0.0.0.0:50051'
+      HOST = Sagittarius::Configuration.config[:rails][:grpc][:host]
 
       def create_server
         @server = GRPC::RpcServer.new(interceptors: [
@@ -15,7 +15,6 @@ def create_server
         ].reverse) # grpc handles interceptors in opposite order. Reversing so we can list them in top-to-bottom order
         logger.info('GRPC server created')
 
-        # TODO: make this configurable
         @server.add_http2_port(HOST, :this_port_is_insecure)
 
         logger.info('Loading application')