update go and swap to graphicsmagic

[erulabs]

• Updates go to 1.8
• Swaps to graphicsmagick gm convert instead of imagemagick

[pastudan]

👍

[briankassouf]

Hey @erulabs! If you switch to gm you no longer need the imagemagick policy:
https://github.com/Imgur/mandible/blob/master/docker/imagemagick_policy.xml

[erulabs]

Hey @briankassouf - thanks haha :) Hope all is well!

[briankassouf]

I don't think the exec command will like this space. You might need to change the runProcessorCommand so that it adds convert as the first item in the argument slice

[briankassouf]

Actually the runProcessorCommand function is used more generically for other types of commands then gm. Perhaps a new function that wraps runProcessorCommand?

[erulabs]

Hrm - yeah - I think i'll just add "convert" as an arg to each of those commands. That way runProcessorCommand stays generic and we can use other parts of gm easily if we want.

[briankassouf]

👍