installer fails under zsh

### Solution to issue cannot be found in the documentation.

- [x] I checked the documentation.

### Issue

The installer claims to be compatible with zsh:

```
if ! echo "$0" | grep '\.sh$' > /dev/null; then
printf 'Please run using "bash"/"dash"/"sh"/"zsh", but not "." or "source".\n' >&2
exit 1
fi
```

But:

```
$ zsh ./Miniforge3-Linux-x86_64.sh
...
Linking urllib3-2.4.0-pyhd8ed1ab_0
Linking requests-2.32.3-pyhd8ed1ab_1
Linking conda-package-handling-2.4.0-pyh7900ff3_2
Linking conda-25.3.0-py312h7900ff3_0
Linking conda-libmamba-solver-25.3.0-pyhd8ed1ab_0

Transaction finished

./Miniforge3-Linux-x86_64.sh:426: no matches found: /home/guest/miniforge3/pkgs/envs/*/
```

This happens because of `set -e` and the directory does not exist so there are no matches. `zsh` fails and exits in this case, whereas `bash` succeeds.

### Installed packages

```shell
None
```

### Environment info

```shell
None
```