Add build args and Dockerfile path override to ImageFromDockerfile #1372
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We're using ImageFromDockerfile for testing base images at Skyscanner. The ability to specify a Dockerfile path and build args have both come up as areas where we can make the developer experience a bit better.
As part of this change I've improved the docs quite a bit, including clarifying everyone's bugbear around providing every file to the build context explicitly. Note that #1348 is a slight wrinkle in the approach documented here, but I think it is OK to fix that separately (the issue serves as documentation of that limitation until we solve it).