- 13 minutes to CI success/failure response from AppVeyor (approx median time); down from 45 minutes
.# [why]
Most of the testing done on AppVeyor is redundant with that done in the GHA:CICD.
With prior settings, AppVeyor was taking about 40 minutes to an hour (median ~ 45
minutes) to report success/failure. In contrast, the GHA:CICD workflow usually completes
in about 13 minutes (median).
AppVeyor job times are approximately 5 to 8 minutes per build and are done sequentially
with no report until all build jobs are complete (whether "allow failure" or not).
- change branch and follow-up commit checkout logic to avoid build failures for PR edge cases
- note: final branch pointer is still preserved to support correct code coverage attribution
* includes a fix/workaround for ongoing `gcc` library issues
- see github:rust-lang/rust#47048 and github:rust-lang/rust#53454
- note: this fix is required for successful gcc/gnu compilation of `expr` on windows
* improves clarity and logging of the AppVeyor config
* "install" phase is more generic and more easily usable within other rust crates
