feat: add support for Dockerfile/Containerfile

[setchy]

#657

[prabhu]

Thank you so much!

[prabhu]

One would expect commercial tools to ignore certain folders by default, like how we do with cdxgen. But nope. They want every repo in the world to have a config file to ignore test directories.

[setchy]

One would expect commercial tools to ignore certain folders by default, like how we do with cdxgen. But nope. They want every repo in the world to have a config file to ignore test directories.

they do ignore some folders by default, but test/tests isn't one 🥲

[prabhu]

Now, don't accidentally click the dependency graph on github by any chance for cdxgen.