cache postgres data

docker-compose.yml

@@ -24,6 +24,8 @@ services:
       - dev
     environment:
       POSTGRES_DB: tuxue
+    volumes:
+      - ~/data:/var/lib/postgresql/data
 
 volumes:
   gems_cache:

entrypoint.sh

@@ -1,6 +1,10 @@
 #!/bin/bash
 set -eu
 
+if ! nc -z postgres 5432; then
+  sleep 3;
+fi
+
 # rake db:create
 rake db:migrate