compile big model in jenkins CI (#38822)

compile chestnut in ci

Jenkinsfile

@@ -252,6 +252,11 @@ node {
           step("test amp", "./openpilot/common/hardware/comma/tests/test_amplifier.py"),
         ])
       },
+      'chestnut': {
+        deviceStage("chestnut", "mici-chestnut-ci", ["UNSAFE=1", "CHESTNUT=1"], [
+          step("compile big model", "./openpilot/selfdrive/test/chestnut.sh"),
+        ])
+      },
 
     )
     }

openpilot/selfdrive/test/chestnut.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+set -e
+
+TARGET=openpilot/selfdrive/modeld/models/big_driving_tinygrad.pkl.chunkmanifest
+rm -f "$TARGET"
+scons --cache-disable "$TARGET"
+test -s "$TARGET"

openpilot/selfdrive/test/setup_device_ci.sh

@@ -58,6 +58,12 @@ chmod +x $CONTINUE_PATH
 
 export GIT_LFS_SKIP_SMUDGE=1
 pull_lfs() {
+  if [ -n "${CHESTNUT:-}" ]
+  then
+    git lfs pull --exclude=''
+    return
+  fi
+
   # The big driving model is not used on these devices yet. Keep its pointer in
   # the worktree, but don't download or copy the 1.8 GB LFS object.
   LFS_EXCLUDE="openpilot/selfdrive/modeld/models/big_driving_supercombo.onnx"