Ignore missing tfstate for first deploy

Refs https://github.com/cloudflare/wildebeest/issues/227

.github/workflows/deploy.yml

@@ -147,6 +147,7 @@ jobs:
           apiToken: ${{ secrets.CF_API_TOKEN }}
         env:
           CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CF_ACCOUNT_ID }}
+        continue-on-error: true
         if: ${{ env.tfstate_kv != '' }}
 
       - name: download VAPID keys