chore: add .devcontainer

[pi0]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 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

Dev containers allow to locally develop and test nitro in isolated (Linux) docker containers.

Made this while locally testing cli issue with linux env. Might be worth to keep this setup in repo (also helps for windows users having a linux env)

https://code.visualstudio.com/docs/devcontainers/containers

Related experiment for nitro: nitrojs/nitro#1633

📝 Checklist

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

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[danielroe]

lovely 👌