Add rustup + CHEZ_CONFIGURE_EXTRA to build-jerboa (fix missing rust install)

ober

d0c24f97ba3385ebf13d9fae1f7ca57fd53f9820

diff --git a/.build.yml b/.build.yml
index 6133e23..d48c939 100644
--- a/.build.yml
+++ b/.build.yml
@@ -20,7 +20,10 @@ artifacts:
 tasks:
   - build-jerboa-tools: |
       cd jerboa
-      make 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-gitsafe: |
       cd jerboa-gitsafe