reference staging deploy token in deploy workflow config

Author: msukkari

.github/workflows/fly-deploy-staging.yml

@@ -26,4 +26,4 @@ jobs:
           cd $GITHUB_WORKSPACE/staging
           flyctl deploy --local-only
         env:
-          FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
+          FLY_API_TOKEN: ${{ secrets.FLY_STAGING_DEPLOY_TOKEN }}