`auto init` fails to add .env to .gitignore

**Describe the bug**

Running `auto init` doesn't add `.env` to `.gitignore` file but to itself.

**To Reproduce**

- Create a new package (`npm init`)
- run `auto init`
- When asked `Would you like to create an .env file? This makes it easy to test and use auto locally.` answers `true` (default behavior).

This will add your tokens to `.env` but also the `.env` to itself rather than to the `gitignore` file.

**Expected behavior**

I expect the `.env` to be added to my `.gitgnore` file and not to my `.env`.

**~Screenshots~ Files**

Here's my `.env` after the `init` command finishes:

```
NPM_TOKEN=not-actual-npm-token
GH_TOKEN=not-actual-github-token

.env
```

**Environment information:**

```txt
"auto" version: v10.37.6
"git" version: v2.37.2
"node" version: v18.6.0
```

**Additional context**
Not context but just signalling that I'm working on the fix as well and not just submitting.