Enable shallow clones for CI and RTD, and explain why.

Author: Nikratio

.github/workflows/test.yml

@@ -17,7 +17,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
-          fetch-depth: 0
+          # Retrieve some git history, which will hopefully include the last release tag
+          # and enable us to generate better version numbers.
+          fetch-depth: 256
 
       - name: Install uv
         uses: astral-sh/setup-uv@v6

.readthedocs.yaml

@@ -7,6 +7,11 @@ build:
     os: ubuntu-22.04
     tools:
         python: "3.11"
+    jobs:
+        post_checkout:
+            # Retrieve some git history, which will hopefully include the last release tag
+            # and enable us to generate better version numbers.
+            - git fetch --depth=256
     apt_packages:
         - build-essential
         - pkg-config