CI: Fetch tags and 200 commits to support describe

[effigies]

This tests the behavior of PRs with the docker build. It should reuse the ghcr.io/nipreps/fmriprep:master cache and create ghcr.io/nipreps/fmriprep:pull-3381 or similar.

It also checks out enough history to properly create a version string.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.06%. Comparing base (03f6cd7) to head (98ad45b).
Report is 13 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3381   +/-   ##
=======================================
  Coverage   72.06%   72.06%           
=======================================
  Files          57       57           
  Lines        4231     4231           
  Branches      456      456           
=======================================
  Hits         3049     3049           
  Misses       1067     1067           
  Partials      115      115           

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[effigies]

Ah right, I turned off building for PRs. We can disable that switch in PRs we want to publish versions for, or figure out some other condition. We can't use the docker/* approach without modifying the tags ourselves.