Re: [quicwg/base-drafts] Cache git repo, draft references in Circle (#3009)

[Mike Bishop <[e-mail]>]

The important piece there are the multi-tiered keys in restore:
```
      - restore_cache:
          name: "Restoring cache - Git"
          keys:
            - v1-cache-git-{{ .Branch }}-{{ .Revision }}
            - v1-cache-git-{{ .Branch }}
            - v1-cache-git-

      - restore_cache:
          name: "Restoring cache - References"
          keys:
            - v1-cache-references-{{ epoch }}
            - v1-cache-references-
```
The revision will never match, so it picks up the most recent git repo cached for that branch.  The epoch will almost never match, so it picks up the most recent reference cache generated.  We could drop the first line of each restore_cache keys directive and get the same behavior.

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