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appimage: Reduce the size of the Docker image

Description

appimage: Reduce the size of the Docker image

* docker/appimage/Dockerfile: Join two RUN statements.

We have the run "zypper clean" in the same RUN statement as "zypper
update" and "zypper install" to ensure that the temporary/cached files
that are added by update/install don't end up in the image.

Details