release process: export env var used by subcommand
Clean up arch name in buildinfo when generating hashes.

Publish release manifests separately by platform and check they are the same in
publish-release.
Remove overzealous ||{}.
publish-release: S3 gives us a Buffer.
Make an environment variable to control where we bind.

This only affects the bundled app (eg, what you'd run in production). The dev mode runner has a bunch of '127.0.0.1' addresses hardcoded, and will need more work.
Don't need to merge pluginDependencies into sliceDependencies for checkUpToDate.

In fact, each slice's dependencies already contains pluginDependencies (see
after the linker.prelink call in Slice.build, and recall that a package's
plugins are always active in itself).