Build failed due to SCCACHE_IDLE_TIMEOUT being too short

[pylbrecht]

Recently trying to ./mach build --release, which resulted in the following output:

▶ ./mach build --release
   Compiling script v0.0.1 (/home/palbrecht/dev/servo/components/script)
error: failed to execute compile
caused by: error reading compile response from server
caused by: Failed to read response header
caused by: failed to fill whole buffer
error: could not compile `script`.

Google led me to #19907. Disabling the timeout fixed the issue for me: export SCCACHE_IDLE_TIMEOUT=0;./mach build --release.

@emilio pointed out that this might be worth filing an issue.

[SimonSapin]

It looks like we’re hitting this on CI too: https://community-tc.services.mozilla.com/tasks/HXPJxNepSsGvj0SoRU8F1g/runs/0

@jdm, @emilio, do you know why we set SCCACHE_IDLE_TIMEOUT to 1200 rather than 0?

[jdm]

I vaguely recall having sccache problems with the default timeout and being told to use a non-zero timeout, but it's been a long time since that conversation.