do not reference env in github workflow env

Author: mcspr

Diff for: .github/workflows/build-ide.yml

@@ -63,7 +63,7 @@ jobs:
         key: ${{ runner.os }}-${{ hashFiles('package/package_esp8266com_index.template.json', 'tests/common.sh') }}
     - name: Build Sketch
       env:
-        ESP8266_ARDUINO_HARDWARE: "$HOME/Documents/Arduino/hardware"
+        ESP8266_ARDUINO_HARDWARE: "${{ runner.temp }}/hardware"
         ESP8266_ARDUINO_SKETCHES: "libraries/esp8266/examples/Blink/Blink.ino"
       run: |
         bash ./tests/build.sh
@@ -87,7 +87,7 @@ jobs:
         key: ${{ runner.os }}-${{ hashFiles('package/package_esp8266com_index.template.json', 'tests/common.sh') }}
     - name: Build Sketch
       env:
-        ESP8266_ARDUINO_HARDWARE: "$HOME/Documents/Arduino/hardware"
+        ESP8266_ARDUINO_HARDWARE: "${{ runner.temp }}/hardware"
         ESP8266_ARDUINO_SKETCHES: "libraries/esp8266/examples/Blink/Blink.ino"
       run: |
         bash ./tests/build.sh