docs: def getImage(path, dockerfile, tag):
      '''Check if an image with a given tag exists. If not, build an image from
      using a given dockerfile in a given path, tagging it with a given tag.
      No extra side effects. Handles and reraises BuildError, TypeError, and
      APIError exceptions.
      '''
      image = getImageByTag(tag)
  
      if not image:
          # Build an Image using the dockerfile in the path
          try:
              image = client.images.build(
                path=path,
                dockerfile=dockerfile,
                tag=tag
              )
          except BuildError as exc:
              eprint("Failed to build docker image")
              raise exc
          except TypeError as exc:
              eprint("You must give a path to the build environemnt.")
              raise exc
          except APIError as exc:
              eprint("Unhandled error while building image", tag)
              raise exc
  
      return image