WIP build: disable inlining for nodeup builds

[hakman]

Apply -gcflags=all=-l only to nodeup release builds to reduce the nodeup binary size without changing compiler flags for kops, protokube, or channels.

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PR needs rebase.

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[justinsb]

Interesting! Does it make a big difference to binary size?

Also, I assume you're trying to limit nodeup memory usage? Is it causing problems? We aren't seeing GOMEMLIMIT so that might be an easy win, but we could also start calling GC explicitly after each task has completed, or we could get more "heavyweight" and start capturing pprof heap profiles. But I would like to better understand the problem first (e.g. is it because I suggested running nodeup persistently?)