compress assets in parallel
compress assets in parallel

Change-Id: I79c2f64f9b0598df01002d19e441ed04fa8cc812
Reviewed-on: https://gerrit.instructure.com/85685
Tested-by: Jenkins
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
Product-Review: Alex Boyd <6bb5a335b0b6c251e818c0de653d342158f949f9@instructure.com>
QA-Review: Alex Boyd <6bb5a335b0b6c251e818c0de653d342158f949f9@instructure.com>

sfu/canvas-lms,SwinburneOnline/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,matematikk-mooc/canvas-lms,grahamb/canvas-lms,instructure/canvas-lms,grahamb/canvas-lms,venturehive/canvas-lms,instructure/canvas-lms,instructure/canvas-lms,grahamb/canvas-lms,matematikk-mooc/canvas-lms,venturehive/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,matematikk-mooc/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,matematikk-mooc/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,instructure/canvas-lms,sfu/canvas-lms,SwinburneOnline/canvas-lms,SwinburneOnline/canvas-lms,djbender/canvas-lms,djbender/canvas-lms,venturehive/canvas-lms,grahamb/canvas-lms,sfu/canvas-lms