ci(NODE-5340): add workflow dispatch and dry-run flag (mongodb#3707)

Author: nbbeeken

.github/workflows/release-nightly.yml

@@ -4,6 +4,8 @@ on:
     # https://crontab.guru/#0_0_*_*_*
     # At 00:00 every day.
     - cron: '0 0 * * *'
+  workflow_dispatch: {}
+
 
 name: release-nightly
 
@@ -25,6 +27,6 @@ jobs:
       - run: npm run build:nightly
         continue-on-error: true
       - if: ${{ success() }}
-        run: npm publish --provenance --tag=nightly
+        run: npm publish --dry-run --provenance --tag=nightly
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}