nix: Add weeder to postgrest-coverage

Removes a bit of dead code from SpecHelper.hs

test/SpecHelper.hs

@@ -1,6 +1,6 @@
 module SpecHelper where
 
-import qualified Data.ByteString.Base64 as B64 (decodeLenient, encode)
+import qualified Data.ByteString.Base64 as B64 (decodeLenient)
 import qualified Data.ByteString.Char8  as BS
 import qualified Data.ByteString.Lazy   as BL
 import qualified Data.Map.Strict        as M
@@ -189,17 +189,10 @@ testMultipleSchemaCfg testDbConn = (testCfg testDbConn) { configDbSchemas = from
 testCfgLegacyGucs :: Text -> AppConfig
 testCfgLegacyGucs testDbConn = (testCfg testDbConn) { configDbUseLegacyGucs = False }
 
-resetDb :: Text -> IO ()
-resetDb dbConn = loadFixture dbConn "data"
-
 analyzeTable :: Text -> Text -> IO ()
 analyzeTable dbConn tableName =
   void $ readProcess "psql" ["--set", "ON_ERROR_STOP=1", toS dbConn, "-a", "-c", toS $ "ANALYZE test.\"" <> tableName <> "\""] []
 
-loadFixture :: Text -> FilePath -> IO()
-loadFixture dbConn name =
-  void $ readProcess "psql" ["--set", "ON_ERROR_STOP=1", toS dbConn, "-q", "-f", "test/fixtures/" ++ name ++ ".sql"] []
-
 rangeHdrs :: ByteRange -> [Header]
 rangeHdrs r = [rangeUnit, (hRange, renderByteRange r)]
 
@@ -226,10 +219,6 @@ authHeader :: BS.ByteString -> BS.ByteString -> Header
 authHeader typ creds =
   (hAuthorization, typ <> " " <> creds)
 
-authHeaderBasic :: BS.ByteString -> BS.ByteString -> Header
-authHeaderBasic u p =
-  authHeader "Basic" $ toS . B64.encode . toS $ u <> ":" <> p
-
 authHeaderJWT :: BS.ByteString -> Header
 authHeaderJWT = authHeader "Bearer"