fix: update Dockerfile

[dierbei]

I increased the ENTRYPOINT in the Dockerfile to default to the path to the wws executable.

And the CMD command can override the default value when running the image.

Fixes: #166

[vmwclabot]

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[ereslibre]

Thank you for your contribution @dierbei! A couple of comments before we can merge it :)

[vmwclabot]

@dierbei, VMware has approved your signed contributor license agreement.

[ereslibre]

Thank you @dierbei! 👏