Checkout action breaks describe

[jw3]

Tagged releases are not capturing the right version number from CI.

The describe that is used to generate the version numbers doesnt like this section of the checkout action

/usr/bin/git rev-parse refs/tags/v0.2.0-rc1
  d5b5a08651c653eaa35cca8ba75c093553058cdf
  /usr/bin/git -c protocol.version=2 fetch --no-tags --prune --progress --no-recurse-submodules origin +8973e4e52a9f3ae149185e2491a084ef3df14f71:refs/tags/v0.2.0-rc1
  From https://github.com/ctc-oss/fapolicy-analyzer
   t [tag update]      8973e4e52a9f3ae149185e2491a084ef3df14f71 -> v0.2.0-rc1

This can be reproduced locally using the same commands that the checkout action uses. I'm not yet sure why the fetch is structured the way it is.

[jw3]

https://github.com/ctc-oss/fapolicy-analyzer/runs/2835212833?check_suite_focus=true#step:6:416

[jw3]

The fetch --no-tags appears to be the culprit

https://github.com/actions/checkout/blob/v2.3.4/src/git-command-manager.ts#L173-L175
actions/checkout#258 (review)

[jw3]

Appears that leaving the ref empty on the checkout was causing this...

Fixed with

      - uses: actions/checkout@v2
        with:
          ref: ${{ github.ref }}
          fetch-depth: 0