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Require LABEL maintainer instead of MAINTAINER (deprecated)
Before: ``` MAINTAINER "Your Name" ``` After: ``` LABEL maintainer "Your Name <[email protected]>" ```
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SPEC.md

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@@ -313,7 +313,7 @@ easily portable between systems, regardless of the programming language they are
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implemented in. We recommend Engine implementors use a `Dockerfile` to automate
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the builds of these images. The `Dockerfile` must follow these specifications:
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* The images must specify a `MAINTAINER`.
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* The image must specify a `maintainer` `LABEL`:
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* The `/code` must be declared as a `VOLUME`.
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* The `WORKDIR` must be specified as `/code`
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* A non-root user named `app` must be created with UID and GID 9000 and declared

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