The way apt works is:
1. It looks at the release file based on the `deb` added to sources.list.
2. It uses this release file to find the relative location of Packages or Packages.gz
3. It uses the pool information from packages to find the relative location of where the .deb file is located and then downloads and installs it.
This PR seeks to take advantage of this information by simply arranging
the files in a way apt expects thereby eliminating the need for an
orchestrating endpoint.
This PR does the following:
1. Creates packages.gz, signed InRelease files for debs in
built_artifacts for configured debian releases.
2. Uploads them to Cloudflare R2.
3. Adds a Workers KV entry that talks about where these assets are
uploaded.