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

ober

185bd176ff817aec6b494e25c23110b2d3d85c80

diff --git a/.build.yml b/.build.yml
index 9e62c7c..3a1aa2f 100644
--- a/.build.yml
+++ b/.build.yml
@@ -15,6 +15,9 @@ artifacts:
 tasks:
   - build-jerboa-tools: |
       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
   - test-shell: |