Allow user to override schema used for v1 of api

src/Config.hs

@@ -20,6 +20,7 @@ data AppConfig = AppConfig {
   , configAnonRole :: String
   , configSecure :: Bool
   , configPool :: Int
+  , configV1Schema :: String
   }
 
 argParser :: Parser AppConfig
@@ -34,6 +35,7 @@ argParser = AppConfig
   <*> strOption (long "anonymous" <> short 'a' <> metavar "ROLE" <> help "postgres role to use for non-authenticated requests")
   <*> switch (long "secure" <> short 's' <> help "Redirect all requests to HTTPS")
   <*> option auto (long "db-pool" <> metavar "COUNT" <> value 10 <> help "Max connections in database pool" <> showDefault)
+  <*> strOption (long "v1schema" <> metavar "NAME" <> value "1" <> help "Schema to use for nonspecified version (or explicit v1)" <> showDefault)
 
 defaultCorsPolicy :: CorsResourcePolicy
 defaultCorsPolicy =  CorsResourcePolicy Nothing