fetchPnpmDeps,pnpmConfigHook: print final config before install

This should help debugging config values. I verified that `pnpm config
list` works across pnpm_8, pnpm_9, pnpm_10, pnpm_10_29_2 and pnpm_11.

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

pkgs/build-support/node/fetch-pnpm-deps/default.nix

@@ -146,6 +146,10 @@ in
               # Run any additional pnpm configuration commands that users provide.
               ${prePnpmInstall}
 
+              echo "Final pnpm config:"
+              pnpm config list
+              echo
+
               # pnpm is going to warn us about using --force
               # --force allows us to fetch all dependencies including ones that aren't meant for our host platform
               pnpm install \

pkgs/build-support/node/fetch-pnpm-deps/pnpm-config-hook.sh

@@ -89,6 +89,10 @@ pnpmConfigHook() {
 
     runHook prePnpmInstall
 
+    echo "Final pnpm config:"
+    pnpm config list
+    echo
+
     if ! pnpm install \
         --offline \
         --ignore-scripts \