🔧 CI: Prune Hatch environments after install

We explicitly run `hatch env prune` right after installing Hatch to ensure that
any stale or corrupted metadata for reserved environments (e.g. `hatch-static-analysis`)
is removed. This avoids `JSONDecodeError` crashes observed in CI when running
`hatch fmt` via pre-commit.

Author: mbercx

template/.github/workflows/.ci.yml

@@ -14,7 +14,9 @@ jobs:
           python-version: '3.13'
 
       - name: Install Hatch
-        run: pip install click==8.2.1 hatch
+        run: |
+          pip install click==8.2.1 hatch
+          hatch env prune
 
       - name: Run pre-commit
         run: hatch run precommit:run