CI: use buildjet for process replay (#29277)

* squash for pr

* backoff to 4vcpu

* review suggestions

* simplify

---------

Co-authored-by: Justin Newberry <jnewberry0502@gmail.com>
Co-authored-by: Justin Newberry <justin@comma.ai>

.github/workflows/setup/action.yaml

@@ -40,6 +40,12 @@ runs:
       run: |
         find . -type f -executable -not -perm 755 -exec chmod 755 {} \;
         find . -type f -not -executable -not -perm 644 -exec chmod 644 {} \;
+    - id: setup-buildx-action
+      if: contains(runner.name, 'buildjet')
+      name: Set up Docker Buildx on buildjet to ensure a consistent cache
+      uses: docker/setup-buildx-action@v2
+      with:
+        driver: docker-container
     # build our docker image
     - shell: bash
       run: eval ${{ env.BUILD }}