Change cache key to use environment

.github/workflows/wled-ci.yml

@@ -50,7 +50,7 @@ jobs:
       uses: actions/cache@v3
       with:
         path: ~/.platformio
-        key: ${{ runner.os }}-${{ hashFiles('platformio.ini') }}
+        key: ${{ runner.os }}-${{ environment}}-${{ hashFiles('platformio.ini') }}
     - name: Set up Python
       uses: actions/setup-python@v4
       with: