ensure RTD has full git history.

Author: MicahGale

.readthedocs.yaml

@@ -9,6 +9,11 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.12"
+  jobs:
+    post_checkout:
+      - git fetch --unshallow || true
+      - git config remote.origin.fetch '+refs/heads/*:refs/remotes/origin/*' || true
+      - git fetch --all --tags || true
 
 # Build documentation in the "docs/" directory with Sphinx
 sphinx: