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Make first apt example follow all best practices 

This is a bit of a draft, but I came across this issue in the documentation. When I searched for `docker apt-get` I found this page and copy-pasted the first example, but then I remembered it's best practice to install all packages at once and after that clear the `lists` to minimize the image size. Putting the example with all best practices first might help newer docker users to produce smaller images.
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Duncan Ogilvie 2020-09-28 22:55:35 +02:00 committed by GitHub
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develop/develop-images/dockerfile_best-practices.md
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@ -352,7 +352,8 @@ RUN apt-get update && apt-get install -y \
cvs \
git \
mercurial \
subversion
subversion \
&& rm -rf /var/lib/apt/lists/*
```
### Leverage build cache
@ -482,7 +483,8 @@ statement. For example:
RUN apt-get update && apt-get install -y \
package-bar \
package-baz \
package-foo
package-foo \
&& rm -rf /var/lib/apt/lists/*
```
Using `apt-get update` alone in a `RUN` statement causes caching issues and