[dashboard] keep device screen off while not building

[yjbanov]

We drain the battery too fast. We should:

• keep device screen off, while not building
• alert when battery level goes below 70%

Available tools

This tells you if the device is awake or not (Display Power: state=ON is another potential option):

adb shell dumpsys power | grep 'mWakefulness='

This virtually presses the power button (hence the need to check wakefulness first):

adb shell input keyevent 26

This virtually unlocks the screen:

adb shell input keyevent 82

This tells you the battery level:

adb shell dumpsys power | grep 'mBatteryLevel='

[github-actions]

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