lib/upgrade: Auto upgrade signature should cover version & arch #3043
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Purpose
New signature is the HMAC of archive name (which includes the release
version and architecture) plus the contents of the binary. This is
expected in a new file "release.sig" which may be present in a
subdirectory. The new release tools put this in [.]metadata/release.sig.
Testing
So far, just manually. We should add some coverage over this though...