docker-image: disable buildkit on armv7
buildkit is giving issues on armv7 after upgrading to musl-1.2. This is most likely seccomp related. Without buildkit, there are no issues. But we cannot blankly disable buildkit as the features we are using require an up-to-date docker version, which is not the case everywhere yet. So disable this for armv7 so that we can continue building images.
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