Reduce docker image size

[alteredego]

Hello team, thanks for such a great product!

I was taking a look at your datalust/seq docker images and note that it should be possible to roughly halve the size of the image as they contain a duplicated file layer.

https://hub.docker.com/layers/datalust/seq/latest/images/sha256-671cd1b032ff724911e4784054fc9c9c07b07d282465999e882b0a3511ae2867

Layer 12 and Layer 13 are virtually identical in size ~106 Mb and contain duplicate files.

Layer 13 is running chmod and chgrp commands which ends up adding full copies of some big files, whereas you could be pre-applying this in a different docker build stage and then just add them once to the final image.

Hope this helps!

Alex

[nblumhardt]

Thanks for spotting that, @alteredego, we'll take a look 👍