doc: document "Resume Build" limitation
Compiled binaries for fanned CI builds on Windows and ARM are only kept for seven days. Document that a fresh CI should be started if more than seven days have elapsed since the original failing CI.
Refs: https://github.com/nodejs/build/pull/1515#issuecomment-443390609
cc @BethGriggs
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines