Try to fix docs build

.github/workflows/ci.yml

@@ -66,6 +66,9 @@ jobs:
   docs:
     name: Documentation
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      statuses: write
     steps:
       - name: Install libraries
         run: |
@@ -79,6 +82,10 @@ jobs:
         with:
           version: '1.11'
 
+      - uses: julia-actions/cache@v2
+        with:
+          cache-registries: "true"
+
       - name: Add MPIPreferences
         shell: julia --color=yes --project=. {0}
         run: |