Describe the bug
If a single-character file exists in the directory where distrobox-assemble is executing and it shares a character with one contained in the name of a distrobox to be assembled, it will fail.

 - Deleting ...
Error response from daemon: No such container: my-distrobox
Error response from daemon: No such container: my-distrobox
Cannot find container my-distrobox.
 - Creating ...
 already exists

my-distrobox is the default container name and it's used because $name is never set. This is due to file globbing in the matching a single character file in the current directory, so the line becomes:
w

instead of
[tw]

and the section definition is not interpreted.

This is regression introduced in commit 1bb261a.

        # shellcheck disable=SC2013
        for line in $(cat "${file}"); do
                # Remove comments and trailing spaces

The unquoted file contents are being interpreted by the shell rather than being passed as read.

To Reproduce
Create a distrobox.ini:

image=registry.opensuse.org/opensuse/distrobox:latest
init=true
nvidia=false
pull=true
root=false
replace=true
start_now=false
additional_packages="git vim ctags go1.24 osc fileb0x obs-service-go_modules"
volume="/src:/src"
volume="/var/scratch:/var/scratch"

and create a file in the same directory:
:> w

Then distrobox assemble create

Expected behavior
A distrobox named foo will be created