Shakapacker has environment variable leak via EnvironmentPlugin that exposes secrets to client-side bundles
### Summary Since 2017, the default webpack plugins have passed the entire `process.env` to `EnvironmentPlugin`. This pattern exposed ALL build environment variables to client-side JavaScript bundles whenever application code (or any dependency) referenced `process.env.VARIABLE_NAME`. This is not a regression - the vulnerable code has existed since the original Webpacker implementation. No recent code change in Shakapacker triggered this issue. ### Impact Any environment variable in the build environment that is referenced in client-side code (including third-party dependencies) is embedded directly into the JavaScript bundle. This includ
- Actualiza a 9.5.0
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