feat: rely on command environment instead of PID file #222
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Pid files haven't been very reliable for the purpose of knowing if a background service is running and what is its PID. With this new approach, we start all the background services with an extra environment variable called
LINKUP_SERVICE_ID
, which then we query for knowing if the service is running and what is its PID.Closes SHIP-2049
Related to SHIP-2057