brew-release: cut a release from the Linux box it is cut from

Nothing about updating the formula needs a mac or needs brew -- it
resolves a ref, fetches a tarball, hashes it, rewrites three stanzas.
But it hashed with `shasum`, which is perl's and only usually present
on Linux, where `sha256sum` is coreutils and always is. Take whichever
exists, as macos-remote-build already did.

The version count no longer falls back to 0 when the commit is not in
this clone. `0.1.0-0-<short>` is older than every version published, so
a release cut from a clone that had not fetched yet would have looked
like a downgrade and never installed; say so and stop instead.

Also written down: why the formula builds from source rather than
shipping the notarized zip the mac builder makes -- brew's curl sets no
quarantine attribute, so notarization gains a formula nothing, and the
build is a minute with zig as its only dependency. If that ever changes
the answer is bottles, which are additive and cost a per-macOS-version
matrix, not a cask.

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