add setting to avoid optimisations outside docker

services/clsi/app/coffee/OutputCacheManager.coffee

@@ -171,6 +171,11 @@ module.exports = OutputCacheManager =
 			else if err?
 				logger.error err: err, src: src, dst: dst, "copy error for file in cache"
 				callback(err)
+			else
+				if Settings.clsi?.optimiseInDocker
+					# don't run any optimisations on the pdf when they are done
+					# in the docker container
+					callback()
 				else
 					# call the optimiser for the file too
 					OutputFileOptimiser.optimiseFile src, dst, callback