Extracts the avatar components and the style tokens into shared/ui, which
both apps consume as a workspace package, to try out ADR 2. Nix and the
Docker setups are not updated yet.
- release: work on `master`, find radicle-apt-repo next to the monorepo,
tag `releases/desktop/<version>` and only commit the release files
- install-binaries: use desktop's own `tests/`, not the root one
- build-artifacts: pass `GIT_HEAD` to the Linux builds, which only see
`desktop/` and have no `.git`
- .envrc: watch `rust-toolchain.toml`