basic scaffold: `metal up`

[linear[bot]]

• similar to railway up or vercel, uploads the current directory (just git-tracked files)
• upload target should be an API route in the next app
• next app should receive the upload and unpack it in a temporary directory
• next app endpoint should have a mechanism for streaming a response back to the CLI as it processes the upload

[linear[bot]]

MET-10 basic scaffold: `metal up`

[rgarcia]

testing comments from linear

[folushooladipo]

Seen.