marvin
524ef3e793
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Add support for the Dockerfile USER directive so that the container's CMD/ENTRYPOINT runs as the configured user instead of root. Changes: - inject.rs: Add user field to Config struct, write /slim/user at build time - build.rs: Pass config.user through to inject() - slim-init.sh: Read /slim/user and drop privileges via su before executing the command. Numeric uids are resolved to usernames via /etc/passwd (BusyBox su does not accept numeric args). When dropping privileges, run as a child (not exec) so PID 1 stays root and can poweroff after the command exits. - test.sh: Add test_user verifying build-time CMD and --cmd override both run as the configured user Closes #7