Fix missing BUILDER_NAME env in test assertions step

Author: dash14

.github/workflows/test.yml

@@ -90,6 +90,8 @@ jobs:
         run: node report/main.mjs ./compose.yml || true
 
       - name: Run assertions
+        env:
+          BUILDER_NAME: ${{ matrix.builder_name }}
         run: ${{ matrix.assert_script }}
 
       - name: Cleanup