feat: new configuration system (and schema) (#2819)

script/worker.rb

@@ -6,5 +6,10 @@ $stderr.sync = true
 
 require_relative "../config/environment"
 
-HealthServer.start(name: "worker", default_port: 9090)
+HealthServer.start(
+  name: "worker",
+  default_port: Postal::Config.worker.default_health_server_port,
+  default_bind_address: Postal::Config.worker.default_health_server_bind_address
+)
+
 Worker::Process.new.run