Add migrate-workspace-deps script

This script will migrate all crate-level version dependencies to the
top-level.

It won't work for more esoteric configurations, and print a warning.

Signed-off-by: Marcel Müller <neikos@neikos.email>

flake.nix

@@ -27,6 +27,17 @@
 
           text = builtins.readFile ./gitlab-job-status;
         };
+
+        migrate-workspace-deps = pkgs.writeShellApplication {
+          name = "migrate-workspace-deps";
+          runtimeInputs = [
+            pkgs.jq
+            pkgs.git
+            pkgs.yq
+          ];
+
+          text = builtins.readFile ./migrate-workspace-deps;
+        };
       });
     };
 }