Update OIDC workflow configuration (#330)

Author: maxrjones

.github/workflows/pypi-release.yaml

@@ -61,6 +61,11 @@ jobs:
   test-built-dist:
     needs: build-artifacts
     runs-on: ubuntu-latest
+    environment:
+      name: release
+      url: https://test.pypi.org/p/cmip6-downscaling
+    permissions:
+      id-token: write
     steps:
       - uses: actions/[email protected]
         name: Install Python
@@ -82,15 +87,18 @@ jobs:
       - name: Publish package to TestPyPI
         uses: pypa/[email protected]
         with:
-          password: ${{ secrets.TEST_PYPI_TOKEN }}
           repository-url: https://test.pypi.org/legacy/
           # verbose: true
 
   upload-to-pypi:
     needs: test-built-dist
     if: github.event_name == 'release'
     runs-on: ubuntu-latest
-    environment: release
+    environment:
+      name: release
+      url: https://pypi.org/p/cmip6-downscaling
+    permissions:
+      id-token: write
     steps:
       - uses: actions/download-artifact@v4
         with: