This requires [infra#1448](https://github.com/e2b-dev/infra/pull/1448)
first.
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> Adds support to override the sandbox API URL (E2B_SANDBOX_URL) across
JS/Python SDKs, centralizes sandbox host/url logic with headers, and
updates CI to build the SDK before CLI.
>
> - **SDKs (JS & Python)**
> - Add `sandboxUrl` support in `ConnectionConfig` (env var
`E2B_SANDBOX_URL`), with new helpers `getSandboxUrl`/`getHost` and
shared `envdPort`.
> - Refactor sandbox initialization to use
`ConnectionConfig.getSandboxUrl(...)` and `getHost(...)`.
> - Always attach sandbox headers `E2b-Sandbox-Id` and
`E2b-Sandbox-Port` to sandbox and connect requests.
> - Python: thread `sandbox_url` through opts; update async/sync connect
calls to pass headers; minor fix to default `headers=None` in
`e2b_connect.client.Client` stream prep.
> - **CI**
> - Build `packages/js-sdk` before `packages/cli`; set step
`working-directory` for build/test.
> - **Dependencies**
> - Point `e2b` dependency in lockfile to local `../js-sdk` link.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
5dc58171af6c170f8640f49d736dbe9c571f2b21. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
---------
Co-authored-by: Mish <10400064+mishushakov@users.noreply.github.com>
Joseph Lombrozo
bbeff746f8