Migrations configuration

config/Configuration.dhall

@@ -0,0 +1,7 @@
+{ database : { username : Text
+             , password : Text
+             , host : Text
+             , database : Text
+             , migrations : Text }
+, store : { path : Text }
+}

config/config.dhall.sample

@@ -4,5 +4,7 @@
     , password = "password"
     , host = "hostname"
     , database = "ebook"
+    , migrations = "./migrations"
   }
+  store = { path = "/tmp/store" }
 }