Set invalidation prefix

Author: Serjlee

.github/workflows/deploy-production.yml

@@ -86,4 +86,5 @@ jobs:
         uses: nathanvaughn/actions-cloudflare-purge@master
         with:
           cf_zone: ${{ secrets.CLOUDFLARE_ZONE }}
-          cf_auth: ${{ secrets.CLOUDFLARE_PURGE_API_TOKEN }}
+          cf_auth: ${{ secrets.CLOUDFLARE_PURGE_API_TOKEN }}
+          prefixes: https://docs.arduino.cc/resources/datasheets/