Add cleanup for apt cache files

[shot4free]

Adding this step decreases the size of the image.

ssh-audit-new latest 0c391ba567ee 39 minutes ago 157MB ssh-audit-old latest a425e0043125 40 minutes ago 176MB

[jtesta]

@shot4free : Thanks for the PR! Unfortunately, it introduces a syntax error. It seems like the patch is missing && before the rm command:

$ make -f Makefile.docker 
[...]
Step 3/9 : RUN apt clean && apt update && apt -y dist-upgrade && apt clean rm -rf /var/lib/apt/lists/*
 ---> Running in f83aacb5ee5f
[...]
E: Command line option 'r' [from -rf] is not understood in combination with the other options.
The command '/bin/sh -c apt clean && apt update && apt -y dist-upgrade && apt clean rm -rf /var/lib/apt/lists/*' returned a non-zero code: 100
make: *** [Makefile.docker:7: all] Error 100

Once this is fixed, though, I'd be happy to merge it!

[shot4free]

@shot4free : Thanks for the PR! Unfortunately, it introduces a syntax error. It seems like the patch is missing && before the rm command:

$ make -f Makefile.docker 
[...]
Step 3/9 : RUN apt clean && apt update && apt -y dist-upgrade && apt clean rm -rf /var/lib/apt/lists/*
 ---> Running in f83aacb5ee5f
[...]
E: Command line option 'r' [from -rf] is not understood in combination with the other options.
The command '/bin/sh -c apt clean && apt update && apt -y dist-upgrade && apt clean rm -rf /var/lib/apt/lists/*' returned a non-zero code: 100
make: *** [Makefile.docker:7: all] Error 100

Once this is fixed, though, I'd be happy to merge it!

Yes, you are right. Forgot about "&&". Not it is fixed.

[jtesta]

Merged. Thanks!!