[ci] Setting up non-regression tests

    * Checkout ConstraintGeometry step

Author: th-skam

.github/workflows/ci.yml

@@ -81,7 +81,13 @@ jobs:
         with:
           name: ${{ steps.sanitize.outputs.artifact_name }}
           path: ${{ env.WORKSPACE_ARTIFACT_PATH }}
-      
+
+      - name: Checkout ConstraintGeometry
+        uses: actions/checkout@v2
+        with:
+          repository: InfinyTech3D/ConstraintGeometry
+          path: deps/ConstraintGeometry
+
       - name: Set env vars for tests
         shell: bash
         run: |