Stable route for release.json

[ebezzi]

Fixes #400

[codecov]

Codecov Report

Merging #409 (17d84fe) into main (5f5deac) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #409   +/-   ##
=======================================
  Coverage   88.35%   88.35%           
=======================================
  Files          50       50           
  Lines        2730     2730           
=======================================
  Hits         2412     2412           
  Misses        318      318           

Flag	Coverage Δ
unittests	88.35% <100.00%> (ø)

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Impacted Files	Coverage Δ
..._census/src/cellxgene_census/_release_directory.py	100.00% <100.00%> (ø)

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[atolopko-czi]

LGTM. Didn't realize the endpoint was already set up, but it worked for me, so 🎉 !

(Could remove ", formatted as a CensusDirectory" in the Python comment , since that seems wrong)