Improved docker rust cache

Earthfile

@@ -1,7 +1,8 @@
 VERSION --try --global-cache 0.7
 PROJECT ontola/atomic-server
 IMPORT ./browser AS browser
-IMPORT github.com/earthly/lib/rust:2.2.11 AS rust
+# IMPORT github.com/earthly/lib/rust:2.2.11 AS rust
+IMPORT github.com/earthly/lib/rust:nacho/with_docker AS rust
 FROM rust:1.73.0-buster
 WORKDIR /code
 
@@ -45,10 +46,8 @@ source:
 cross-build:
   FROM +source
   ARG --required TARGET
-  # This does not yet cache properly
-  # https://github.com/earthly/lib/issues/34
   WITH DOCKER
-    RUN cross build --target $TARGET --release
+    DO rust+CARGO --args="cross" --$with_docker="--load ghcr.io/cross-rs/$TARGET:v0.2.5"
   END
   SAVE ARTIFACT ./target/$TARGET/release/atomic-server AS LOCAL artifact/bin/atomic-server-$TARGET