git config?

home/profiles/git/default.nix

···
       pull.rebase = false;
       push.autoSetupRemote = true;
       init.defaultBranch = "main";
+      "url \"[e-mail]:\"" = { insteadOf = "https://github.com/"; };
     };
 
     aliases = {
···
 
       # delete merged branches
       bdm = "!git branch --merged | grep -v '*' | xargs -n 1 git branch -d";
+      undo = "!git reset HEAD~1 --mixed";
+      blm = "blame -w -C -C -C";
     };
   };
 }