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

ober

85dc379c5cfd4b12df92270edc212bf2438f1906

diff --git a/.builds/ci.yml b/.builds/ci.yml
index 827139f..0dbf4b4 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: |