Add Rust for Rustler

Dockerfile

@@ -1,5 +1,10 @@
+FROM rust as rust
+
 FROM ghcr.io/livebook-dev/livebook:latest-cuda11.8
 
+COPY --from=rust /usr/local/cargo /usr/local/cargo
+RUN rustup default stable
+
 ENV LIVEBOOK_APP_SERVICE_NAME "🐳 Hugging Face - $SPACE_TITLE"
 ENV LIVEBOOK_APP_SERVICE_URL "https://huggingface.co/spaces/$SPACE_AUTHOR_NAME/$SPACE_REPO_NAME"
 ENV LIVEBOOK_UPDATE_INSTRUCTIONS_URL "https://livebook.dev"
@@ -8,7 +13,7 @@ ENV LIVEBOOK_APPS_PATH "/public-apps"
 ENV LIVEBOOK_APPS_PATH_WARMUP "manual"
 ENV LIVEBOOK_DATA_PATH "/data"
 ENV LIVEBOOK_PORT 7860
-
+ENV PATH=$PATH:/usr/local/cargo/bin
 EXPOSE 7860
 
 RUN mkdir -p /data
@@ -20,5 +25,5 @@ ENV HOME=/home/user
 
 USER user
 
-COPY --chown=user public-apps/ /public-apps
-RUN /app/bin/warmup_apps
+# COPY --chown=user public-apps/ /public-apps
+RUN /app/bin/warmup_apps