Rockstarify the docker-compose

BTCPayServer.Tests/docker-compose.yml

@@ -41,7 +41,8 @@ services:
 
   # The dev container is not actually used, it is just handy to run `docker-compose up dev` to start all services
   dev: 
-    image: coscale/docker-sleep
+    image: alpine:3.7
+    command: [ "/bin/sh", "-c", "trap : TERM INT; while :; do echo Ready to code and debug like a rockstar!!!; sleep 2073600; done & wait" ]
     links:
       - nbxplorer
       - postgres