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Create a Dockerfile to enable a portable build environment. The Dockerfile is based on Ubuntu 24.04, and uses multiple stages to produce a minimal final product, with the final image size sitting at about 75mb. This branch also incorporates the updates prepared by @cole-h to update to squashfs-tools 4.4 in devttys0#56. Finally, building on newer GCC highlights a dangling pointer error in LzmaEnc.c. I have separated the fix for this problem into a dedicated patch file for ease of review.