snap: Add rust-analyzer to snapcraft proxy list

For this to be complete, we must request the proxy to be supported
in the snapcraft store.  This should be done after merging this
to master but before making a new release if we want it to
propagate properly.

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

ci/snapcraft.bash

@@ -43,7 +43,7 @@ fi
 # as rustup.$PROXY.  If we have an alias which is not a supported proxy name
 # then rustup might get sad.
 
-PROXIES="cargo cargo-clippy cargo-fmt cargo-miri clippy-driver rls rustc rustdoc rustfmt"
+PROXIES="cargo cargo-clippy cargo-fmt cargo-miri clippy-driver rls rustc rustdoc rustfmt rust-analyzer"
 
 # From now on, things should be automagic