try to add stable fmt

cb66c59e · Éloïs · 28d24589 · cb66c59e
Commit cb66c59e authored 7 years ago by Éloïs
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,3 +21,6 @@ RUN ./install_rustup.sh

 # Now act as `user`
 USER user
+
+RUN export PATH="$HOME/.cargo/bin:$PATH"
+RUN cargo install rustfmt
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