Ensure use 'Zypper clean' after 'Zypper install'

zypper clean command removes unneeded files that take storage space and affect your final image size. The size reduction can be surprisingly significant.

Risk Level: medium
Platform: Docker
Spectral Rule ID: DOCKR029


Append each zypper install with zypper clean.

FROM busybox:1.0
- RUN zypper install -y httpd=2.4
+ RUN zypper install -y httpd=2.4 && zypper clean

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