My docker `.env` file is created from a jinja2 template. I'm using `{# ... #}` for [comments](https://jinja.palletsprojects.com/en/2.11.x/templates/#comments).

It has this:

```
FOO={{BAR}}        {# blah blah blah #}
SOMETHING=2

```

I expect it to render:

```

FOO=1
SOMETHING=2

```

But it actually renders:

```

FOO=1    SOMETHING=2

```