Frontend teams invent docker script magic to inject env vars at runtime, because rebuilding for every environment was too easy

Developers can now deploy frontend applications with ease using a novel approach to handling environment variables. When building and deploying frontend applications with Docker, environment variables pose a challenge due to bundlers like Vite, Webpack, and esbuild resolving them at build time. To address this, a runtime solution has been devised, allowing for the injection of environment variables at container startup via a config.json file. This file is generated by a shell script, docker-entrypoint.sh, which runs at container startup, and is then fetched by the application at runtime. The approach enables building once and deploying everywhere, eliminating the need for rebuilds when configuration changes. Key benefits include no rebuild requirements, seamless integration with any orchestration system, and support for various frameworks such as Vue, React, and Angular. This innovative solution streamlines the deployment process, enhancing efficiency and flexibility for developers.