Feature: reduce image size

[hazcod]

[fredairic[bot]]

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[iamjoeker]

The primary reason that the image is so large is that it contains all the data needed for scanning. IMHO, this is a good thing. Otherwise, it would take significantly longer to spin up a new container as all the data needed for scanning would have to be downloaded. Personally, I prefer for the image to contain the scanning data and be as up to date as possible so that I can launch a container and update definitions in a reasonable amount of time.

[hazcod]

Fyi this still uses openvas 9 while 11 is available.

[turkmenkaan]

It might be possible to reduce the image size by using a smaller base image than Ubuntu.