Absolute paths - EISDIR: illegal operation on a directory

[Jacques Yakoub]

Hello,

As you can see on this screenshot, it seems that absolute paths aren’t supported.
I checked inside the source code and I think the [ContentLoader](https://bitbucket.org/atlassian/openapi-diff/src/master/lib/openapi-diff/content-loader.ts) is to blame. ( I saw also no test about this case in your tests : https://bitbucket.org/atlassian/openapi-diff/src/master/test/e2e/cli.spec.ts )

Thanks for your work

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[Jacques Yakoub]

It seems it is a bug on Github Actions : sorry for the issue