Add separate property to platformio.ini to control the environments built by github actions

This is now independent of the default_envs which also affects local development

.github/workflows/build.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Get default environments
         id: envs
         run: |
-          echo "environments=$(pio project config --json-output | jq -cr '.[0][1][0][1]')" >> $GITHUB_OUTPUT
+          echo "environments=$(pio project config --json-output | jq -cr '.[1][1][0][1]|split(",")')" >> $GITHUB_OUTPUT
 
     outputs:
       environments: ${{ steps.envs.outputs.environments }}