deb: speed up cross-arch worker builds by installing deps into mounted target rootfs #923
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…d target rootfs Signed-off-by: Kartik Joshi <karikjoshi21@gmail.com>
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When building DEB worker images for a non-native platform (e.g. linux/arm64 on an amd64 host), running apt install inside a target-arch container forces most of the install pipeline through QEMU and dominates build time.
This PR implements proposal for Debian/Ubuntu by running apt natively on the build platform while installing into a mounted target rootfs, so dependency solving/download/unpack happen at native speed. Maintainer scripts may still invoke QEMU when they execute target-arch binaries (expected).