makechrootpkg: support bind mount tmpfs besides existing directories
A .cache can be bind mounted into the container to save the caches for reuse, but sometimes we want to exclude specific caches (because they don't work well, e.g. bazel's).
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A .cache can be bind mounted into the container to save the caches for reuse, but sometimes we want to exclude specific caches (because they don't work well, e.g. bazel's).