Shouldn't this just work?

[eternal lark]

      .withExec(["pnpm", "config", "set", "store-dir", "/pnpm/store"])
      .withMountedCache("/pnpm/store", dag.cacheVolume("pnpm-store"))
      .withExec(["pnpm", "install", "--frozen-lockfile"])

[pine panther]

Seems like it. Mind sharing a simple complete repro if you can? Same reply as here: https://discord.com/channels/707636530424053791/1423593257933344848, it's hard for us to be helpful which such little information