add configurable setting to enable running app for tor

src/Settings.hs

@@ -53,6 +53,7 @@ data AppSettings = AppSettings
     , sslKeyLocation            :: FilePath
     , sslCsrLocation            :: FilePath
     , sslCertLocation           :: FilePath
+    , enableTor                 :: Bool
     }
 
 instance FromJSON AppSettings where
@@ -67,6 +68,7 @@ instance FromJSON AppSettings where
         resourcesDir              <- o .: "resources-path"
         sslPath                   <- o .: "ssl-path"
         registryHostname          <- o .: "registry-hostname"
+        enableTor                 <- o .: "enable-tor"
 
         let sslKeyLocation  = sslPath </> "key.pem"
         let sslCsrLocation  = sslPath </> "certificate.csr"