correct esp32 v2 ci build

Author: hathach

.github/workflows/githubci.yml

@@ -112,7 +112,7 @@ jobs:
       - name: Create custom build script
         working-directory: ${{ github.workspace }}/ci
         run: |
-          echo 'import build_platform' > build_esp32_stable.py
+          echo 'import build_platform' > build_esp32_v2.py
           echo 'build_platform.test_examples_in_folder("'${{ matrix.arduino-platform }}'")' >> build_esp32_v2.py
 
       - name: test platforms