Update CONTRIBUTING.md for how to set up a Docker builder #4668
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Previously, I was using buildkit (qemu) to build arm64/armv7 docker image.
However, for some reason, it is no longer working for arm64. It is extremely slow and
npm ci --omit=dev
always failed withnpm ERR! errno ECONNRESET
error. Tested on different PCs and different networks. Maybe ourpackage-lock.json
is getting big now.To overcome the issue, now I set up a special Docker builder which will pass the arm64 build job to my real arm64 machine.