add oval docker

[sadayuki-matsuno]

What did you implement:

Add oval docker settings

How did you implement it:

add dockerfile

How can we verify it:

$ for i in `seq 5 7`; do \
    docker run --rm -it \
    -v $PWD:/vuls \
    -v $PWD/goval-dictionary-log:/var/log/vuls \
    vuls/goval-dictionary fetch-redhat $i; \
  done

Todos:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO