WaitStep and TailStep now run in goroutines, and are tracked with a stepCtx which has a timeout attached. Once stepCtx expires, the step is killed with DestroyStep.
The default timeout is set to 5m, and is configureable using SPINDLE_PIPELINES_STEP_TIMEOUT.
Signed-off-by: Anirudh Oppiliappan anirudh@tangled.sh