I added ImageMagick to graffer.

A few days ago I introduced graffer, a Docker image for wrapping grapics utilities (starting from cairosvg).

I restructured it a bit and added ImageMagick to the lot. The wrapper script is now inclued in the image itself, print it out with:

docker run --rm graffer:active --wrapper

This wrapper script can be linked (symbolically) to also call magick now. Yay!