workflow/lint: cache collections (hopefully)

.forgejo/workflows/lint.yml

@@ -26,6 +26,13 @@ jobs:
         with:
           cache: 'pip'
 
+      - name: cache '.ansible/collections'
+        id: cache-collections
+        uses: actions/cache@v4
+        with:
+          path: .ansible/collections
+          key: ${{ runner.os }}-zfs_dkms-ansible-collections
+
       - name: ansible/collections
         run: |
           pip install ansible-core ansible-lint