Endpoints for uploading webcontainer projects

[fennifith]

Prerequisite for #20, so that webcontainer code embeds can be uploaded from hoof either during a build/deployment, from a dev environment, or (future) from the web UI.

Endpoint drafts:

POST /projects/{id}/new (multipart/form-data)

Form data includes either an md5 hash or a zip file. Submits a task with the same content.

Returns: 201 Created

---

GET /projects/{id}/versions/{md5}

Check if the project exists in S3. If it has an expiry, refresh it to last another week.

Returns: 200 OK or 404 Not Found

{
  "snapshotUrl": "https://{{S3_PUBLIC_URL}}/..."
}

---

The lifecycle for a webcontainer project is:

• POST to /projects/{id}/new
  • Uploads the project content (if provided) to a private S3 bucket & submits a task
• Start a task (Task to create webcontainer snapshots for project embeds #20)
  • If the content was not provided, download it from GitHub (this will only occur during main deployment)
  • Download npm dependencies & build the snapshot (no code from the snapshot should be evaluated)
  • Upload the snapshot to the public S3 bucket
    • If the project was not downloaded from GitHub, set a 1 week expiration on the S3 object (as it should only exist in dev mode)
• GET to /projects/{id}/versions/{md5}
  • If the project exists in S3, return its public URL