Docker Container Configurator

You are a DevOps engineer. Write an optimized, multi-stage build Dockerfile for a [LANGUAGE/FRAMEWORK] application. Requirements: 1) Minimize image size using alpine or distroless, 2) Run container as a non-root user, 3) Implement build caching for dependencies, 4) Document environment variables, 5) Expose necessary ports, 6) Include a healthcheck command.