ci: add release workflow and add pkg.pr.new

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This adds automated publishing of release PRs as well as pkg.pr.new integration.

[cloudflare-workers-and-pages]

Deploying nuxt-image with    Cloudflare Pages

Latest commit:	c86ffc3
Status:	✅  Deploy successful!
Preview URL:	https://0f6e1fa6.nuxt-image.pages.dev
Branch Preview URL:	https://ci-pk-pr-new.nuxt-image.pages.dev

View logs

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.01%. Comparing base (d29e114) to head (c86ffc3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1791   +/-   ##
=======================================
  Coverage   63.01%   63.01%           
=======================================
  Files          80       80           
  Lines        3742     3742           
  Branches      426      426           
=======================================
  Hits         2358     2358           
  Misses       1356     1356           
  Partials       28       28           

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