fix(ci): append trailing slash to registry url in npmrc

[rmedranollamas]

Summary

This PR appends a trailing slash to the @google registry URL in both the root .npmrc and .github/actions/setup-npmrc/action.yml. This fixes the nightly release credential mapping issue where npm was unable to match credentials with the registry.

Details

Without the trailing slash (/), npm publish fails with ENEEDAUTH because the registry endpoint https://wombat-dressing-room.appspot.com/ (which npm resolves with a trailing slash) does not match the exact key //wombat-dressing-room.appspot.com:_authToken or similar credential mapping without the slash. Aligning both files to include the trailing slash resolves this authentication mismatch.

Related Issues

Fixes #28029 Fixes #28028 Fixes #28026 Fixes #27991 Fixes #27955

How to Validate

Validate that the setup is syntactically correct and aligns with standard npm scoped registry configurations:

1. Ensure .npmrc matches the setup-npmrc action configuration.
2. The nightly release workflow will utilize the setup-npmrc action, where @google:registry=https://wombat-dressing-room.appspot.com/ is properly written.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker

[github-actions]

📊 PR Size: size/XS

• Lines changed: 4
• Additions: +2
• Deletions: -2
• Files changed: 2

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an authentication issue during npm publish by ensuring the @google registry URL configuration includes a trailing slash. This alignment resolves mismatches between the registry endpoint and the credential mapping, preventing ENEEDAUTH errors in the nightly release workflow.

Highlights

• Registry URL Configuration: Appended a trailing slash to the @google registry URL in both the root .npmrc and the setup-npmrc GitHub action to ensure proper credential matching.

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[gemini-code-assist]

Code Review

This pull request updates the @google registry URL by appending a trailing slash in both .github/actions/setup-npmrc/action.yml and .npmrc. I have no feedback to provide.