fix: Static ruby

Author: sgillespie

flake.nix

@@ -38,6 +38,21 @@
           cbor-diag = final.callPackage ./pkgs/cbor-diag { };
           cddl = final.callPackage ./pkgs/cddl { };
          });
+
+         tools = (final: prev: {
+           ruby = prev.ruby.overrideAttrs (old: {
+             # Fix the following error on musl64 Ruby:
+             #
+             #     error: output '/nix/store/6hyyk9wnnxpd5rsr6ivc0s8l1lgvsjrb-ruby-x86_64-unknown-linux-musl-3.3.4'
+             #     is not allowed to refer to the following paths:
+             #             /nix/store/c77wdd4fb0llq37bpmfr73m7s7r1j068-ruby-3.3.4
+             #
+             # See https://github.com/NixOS/nixpkgs/issues/347758
+             postInstall = old.postInstall + ''
+               find $out/${old.passthru.gemPath} -name exts.mk -delete
+             '';
+           });
+         });
        };
        supportedSystems = [
             "x86_64-linux"