add manual workflow_dispatch trigger

Author: rossnoah

.github/workflows/Platformio_CI.yml

@@ -1,6 +1,8 @@
 name: PlatformIO CI
 
-on: [push]
+on:
+  push:
+  workflow_dispatch:
 
 jobs:
   build:
@@ -16,7 +18,7 @@ jobs:
           key: ${{ runner.os }}-pio
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: "3.11"
       - name: Install PlatformIO Core
         run: |
           curl -fsSL -o get-platformio.py https://raw.githubusercontent.com/platformio/platformio-core-installer/master/get-platformio.py