Snap strict confinement: inaccessible search path for git config

[non-descriptive]

Describe the bug
Running gitui installed from snap attempts to access file '/etc/gitconfig which is not accessible in snap context. For proper handling its probably would require configuring additional search paths, similar to this commentary.

To Reproduce

1. Install gitui from snap snap install gitui
2. Create non-bare repository

mkdir -p ./test-repo
cd ./test-repo
git init
 git rev-parse --is-bare-repository # should yield false

or open any existing non-bare repo.
3. run gitui from snap snap run gitui and see error

Error: invalid repo path: failed open - '/etc/gitconfig' is locked: Permission denied; class=Os (2); code=Locked (-14)

Expected behavior
gitui would open main TUI screen

Additional Context

snap run gitui --bugreport

Software version

gitui 0.28.1 (v0.19.0-1066-ge24fb45d-modified)

Operating system

• OS: Linux (Ubuntu Core 24)
• Kernel: 6.1.0-37-amd64

Compile time information

• Profile: release
• Target triple: x86_64-unknown-linux-gnu
• Family: unix
• OS: linux
• Architecture: x86_64
• Pointer width: 64
• Endian: little
• CPU features: crt-static,fxsr,sse,sse2
• Host: x86_64-unknown-linux-gnu

Environment variables

SHELL=/bin/bash
EDITOR=<not set>
GIT_EDITOR=<not set>
VISUAL=<not set>

Command-line

/snap/gitui/380/gitui --bugreport