Fix goModules derivation: disable fixup to avoid store path references

The Go toolchain auto-download (triggered by `toolchain go1.25.8` in
go.mod) puts scripts with shebangs into the module cache. Nix fixup
phase patches these to reference /nix/store paths, violating the
fixed-output derivation contract. dontFixup = true leaves the cache
as-is, which is fine since these files are only consumed as build
inputs by the pyroscope derivation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

containers/pyroscope/default.nix

@@ -34,6 +34,10 @@ let
       cp -r $TMPDIR/go/pkg/mod $out
     '';
 
+    # Disable fixup: patchelf and patchShebangs modify downloaded Go toolchain
+    # binaries, which makes the fixed-output derivation reference store paths
+    dontFixup = true;
+
     outputHashMode = "recursive";
     outputHash = pkgs.lib.fakeHash;
     outputHashAlgo = "sha256";