Commits on Oct 22, 2021

1. chore: add CI env variable configurations …

   This branch adds some environment variables to configure *all* CI jobs.
   In particular, we:
   
   - disable incremental compilation
   - increase the number of retries for network requests in `cargo` and
     `rustup`
   - emit shortened backtraces from panics
   
   This config was blatantly stolen from linkerd/linkerd2-proxy#7137. :)
   
   Incremental compilation is useful as part of an edit-build-test-edit
   cycle, as it lets the compiler avoid recompiling code that hasn't
   changed. However, on CI, we're not making small edits; we're almost
   always building the entire project from scratch. Thus, incremental
   compilation on CI actually introduces *additional* overhead to support
   making future builds faster...but no future builds will ever occur in
   any given CI environment.
   
   See https://matklad.github.io/2021/09/04/fast-rust-builds.html#ci-workflow
   for details.
   
   Increasing retries for network requests should help reduce flakiness a
   bit.

   

   hawkw committed Oct 22, 2021
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