Only run Solid Queue in Puma in dev

In production, we have extra containers for it.

bin/dev

@@ -3,4 +3,4 @@
 echo "Starting Fizzy on http://localhost:3006"
 echo "Login with david@37signals.com using secret123456"
 
-exec ./bin/rails server -p 3006
+SOLID_QUEUE_IN_PUMA=true exec ./bin/rails server -p 3006

config/puma.rb

@@ -21,4 +21,4 @@ pidfile ENV.fetch("PIDFILE", "tmp/pids/server.pid")
 plugin :tmp_restart
 
 # Run Solid Queue with Puma
-plugin :solid_queue
+plugin :solid_queue if ENV["SOLID_QUEUE_IN_PUMA"]