Test out npm staged publishing

Author: pimterry

.github/workflows/ci.yml

@@ -125,11 +125,11 @@ jobs:
         run: |
           if [ "${{ steps.version-check.outputs.is_prerelease }}" == "true" ]; then
             echo "Publishing untagged prerelease"
-            npm publish --provenance --tag test
+            npm stage publish --provenance --tag test
             # We have to publish with a tag (so we use 'test') but we can clean it up:
             npm dist-tag rm mockttp test --silent
           else
             echo "Publishing stable release with 'latest' tag"
-            npm publish --provenance
+            npm stage publish --provenance
           fi