fix(nuxi): hard-reload nuxt when .env changes

[danielroe]

🔗 Linked issue

resolves #15040

❓ 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 like performance)
• ✨ 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

Currently .env variables are not reloaded when they change. This works around that and uses the existing hard-reload functionality to force a fresh cache.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codesandbox]

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[Hebilicious]

Suggestion @danielroe :
Should this supports .env.* instead ? People using something like nuxt dev --dotenv .env.local would need this as well.

[danielroe]

Maybe we could respect whatever is passed to --dotenv

[pi0]

Overall change looks good to me 👍🏼 Supporting custom --dotenv would be also nice :)