Allow users to opt out of reading anything from the expected environment file location

src/Core/Configuration.hs

@@ -7,11 +7,14 @@ import           Crypto.Saltine.Core.SecretBox (newKey)
 import           Crypto.Saltine.Class          (encode)
 import           Configuration.Dotenv
 import           System.Directory              (doesFileExist)
-import           System.Environment            (getEnv)
+import           System.Environment            (getEnv, lookupEnv)
 
 main :: IO ()
 main = do
-  loadFile defaultConfig
+  envFile <- lookupEnv "PURRNOFILE"
+  case envFile of
+    Nothing  -> loadFile defaultConfig
+    _        -> putStrLn "Not using dotenv file"
 
 keyFileInit :: IO ()
 keyFileInit = do