Merge branch 'feat/modify_ci_build' into 'master'

modify CI build example

See merge request ae_group/esp-box!102

.github/workflows/build-examples-gh-pages-on-push.yml

@@ -59,10 +59,11 @@ jobs:
         run: |
           . $IDF_PATH/export.sh
           cd $GITHUB_WORKSPACE/examples/${{matrix.build-dir}}
-
+          if [ -e "${{matrix.boards}}" ]; then
             rm -rf sdkconfig build sdkconfig.defaults
             cp ${{matrix.boards}} sdkconfig.defaults
             # idf.py -D SDKCONFIG_DEFAULTS="sdkconfig.defaults;${{matrix.boards}}" reconfigure
+          fi
 
           if [[ ${{matrix.build-dir}} == usb_camera_lcd_display ]]; then
             if [[ ${{matrix.boards}} == sdkconfig.ci.box-3 ]]; then