`COPY --chmod` reduced the size of my container image by 35%
Earlier this week, I was writing a Dockerfile to download and run a binary when I noticed the image size was way more than what I would expect. I’m using ubuntu:21.10 as the base image, which is about 70MB. The binary I’m running is about 80MB. Other packages I’m installing would add 10-ish MB. But the image size is 267MB? Clearly I’m doing something wrong. But what? My…