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Build ARG missing at runtime

A Dockerfile has `ARG APP_VERSION` and is built with `--build-arg APP_VERSION=2.3.1`. The app reads APP_VERSION from its environment when it runs and finds it empty. Why?

A.ARG exists only during the build; use ENV to keep it in the imageB.Build args are dropped when the image is pushed to a registryC.ARG values must be quoted to survive the buildD.The app must read build args from /proc/args instead

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Build ARG missing at runtime

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