`pack build <app img> --buildpack <buildpack source directory>` allows developer to build app with custom buildpack without using a builder

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GIVEN I have the source code for a cloud native buildpack in a local directory on my machine WHEN I run pack build <image-name> --buildpack <dir> --path <app source code> THEN my image will be built using the buildpack provided in the directory passed into the --buildpack flag

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Note

• Can pass in multiple --buildpack flags
• Uses a supported stack as defined by buildpack.toml of buildpack
• If stack is not available on builder image - throw the following error -

  Unsuccessfully built <image name>. Buildpack is not compatible with the builder image stack <stack ID>.