Current env var syntax won't be anymore supported by Docker and is
currently blocking local development.
```
3 warnings found (use docker --debug to expand):
- LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 2)
```
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> Use "ENV key=value" in generated Dockerfiles and add tests; minor
devcontainer path string cast.
>
> - **Template/Dockerfile generation**:
> - **JS SDK (`packages/js-sdk/src/template/index.ts`)**: Handle `ENV`
instructions and output as `ENV key=value ...`.
> - **Python SDK (`packages/python-sdk/e2b/template/main.py`)**: Same
`ENV` formatting; also cast `devcontainer_directory` to `str` in
devcontainer start command.
> - **Tests**:
> - **JS**: Add `toDockerfile` test covering `ENV` output.
> - **Python (sync/async)**: Add tests for `ENV` output in generated
Dockerfiles.
> - **Changeset**: Patch releases for `@e2b/python-sdk` and `e2b`.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
4a9c504167dd8069551724d83bfa66f0859c1bd4. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
Mish Ushakov
e87576fb7c