Install Rust before make jerboa (native-bundle needs cargo)

ober

9bfbd737ea0e39798a98489cdd5a11007988ec36

diff --git a/.builds/ci.yml b/.builds/ci.yml
index e348995..4850b6b 100644
--- a/.builds/ci.yml
+++ b/.builds/ci.yml
@@ -21,6 +21,9 @@ artifacts:
 tasks:
 - build-jerboa: |
     cd jerboa
+    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | \
+      sh -s -- -y --profile minimal --default-toolchain 1.94.1
+    source "$HOME/.cargo/env"
     make jerboa CHEZ_CONFIGURE_EXTRA=--disable-x11
     echo 'export PATH="$HOME/jerboa/dist:$PATH"' >> ~/.buildenv
 - package: |