add git-remote-annex stub and build machinery

Renamed git-remote-annex.sh, keeping it around for now for reference.

Sponsored-by: Graham Spencer on Patreon

CmdLine/GitRemoteAnnex.hs

@@ -0,0 +1,21 @@
+{- git-remote-annex program
+ -
+ - Copyright 2024 Joey Hess <id@joeyh.name>
+ -
+ - Licensed under the GNU AGPL version 3 or higher.
+ -}
+
+module CmdLine.GitRemoteAnnex where
+
+import Common
+import qualified Annex
+import qualified Git.CurrentRepo
+import Annex.UUID
+import Annex.Action
+
+run :: [String] -> IO ()
+run (_remotename:address:[]) = forever $
+	getLine >>= \case
+		l -> giveup $ "gitremote-helpers protocol error at " ++ show l
+run (_remotename:[]) = giveup "remote address not configured"
+run _ = giveup "expected remote name and address parameters"