Git reads global config file, this leads to problems in some cases

## Expected Behavior

Being able to flash

## Current Behavior

Flash fails (this is on ARM MacOS 15.3).

## Steps to Reproduce

Running the binary from the command line gave me some useful log output:

```
{
context: {
repository: 'https://github.com/ExpressLRS/ExpressLRS',
directory: '/Users/ost/Library/Application Support/ExpressLRS Configurator/firmwares/binary/ExpressLRS',
srcFolder: 'src',
tagName: '3.5.3'
},
level: 'info',
message: 'check out tag',
timestamp: '2025-02-20T21:08:45.477Z'
}
{
context: {
err: Ao [Error]: fatal: unknown style 'zdiff3' given for 'merge.conflictstyle'

at Object.action (/Applications/ExpressLRS Configurator.app/Contents/Resources/app.asar/dist/main/webpack:/expresslrs-configurator/node_modules/simple-git/dist/esm/index.js:3874:25)
at Ld.exec (/Applications/ExpressLRS Configurator.app/Contents/Resources/app.asar/dist/main/webpack:/expresslrs-configurator/node_modules/simple-git/dist/esm/index.js:3901:25)
at /Applications/ExpressLRS Configurator.app/Contents/Resources/app.asar/dist/main/webpack:/expresslrs-configurator/node_modules/simple-git/dist/esm/index.js:1301:43
at new Promise ()
at Gc.handleTaskData (/Applications/ExpressLRS Configurator.app/Contents/Resources/app.asar/dist/main/webpack:/expresslrs-configurator/node_modules/simple-git/dist/esm/index.js:1299:16)
at Gc.next (/Applications/ExpressLRS Configurator.app/Contents/Resources/app.asar/dist/main/webpack:/expresslrs-configurator/node_modules/simple-git/dist/esm/index.js:1283:44)
at Generator.next ()
at a (/Applications/ExpressLRS Configurator.app/Contents/Resources/app.asar/dist/main/webpack:/expresslrs-configurator/node_modules/simple-git/dist/esm/index.js:50:24) {
task: {
commands: [ 'checkout', '3.5.3' ],
format: 'utf-8',
parser: [Function: parser]
}
}
},
stack: [ undefined ],
level: 'error',
message: 'generic error',
timestamp: '2025-02-20T21:08:45.512Z'
}
{
context: { arg: { buildInProgress: false } },
level: 'info',
message: 'received a request to update build status',
timestamp: '2025-02-20T21:08:45.923Z'
}
```

The most important line is this: `err: Ao [Error]: fatal: unknown style 'zdiff3' given for 'merge.conflictstyle'`. This made me realize that the problems comes from the git that you ship (`/Applications/ExpressLRS Configurator.app/Contents/dependencies/darwin_amd64/git-2.29.2/bin/git`) reading my `~/.gitconfig` and getting confused because it does not have the correct `$PATH` to find zdiff3.

## Possible Solution (Not obligatory)

I would suggest running the internal git command with something like `GIT_CONFIG_GLOBAL="" git yadda` which, according to the docs, should prevent your shipped git (which has very little idea of my system, which shell I use and have set up etc.) to read the `~/.gitconfig` file. [Here](https://git-scm.com/docs/git#Documentation/git.txt-codeGITCONFIGGLOBALcode) is the git man page for that env var.

I have tried to just comment out everything in my gitconfig, saved it, ran ELRSConfigurator again, and everything worked.

There is a gotcha from my PoV, namely that git allows to set some proxy commands in `.gitconfig`, like [this](https://git-scm.com/docs/git-config#Documentation/git-config.txt-coregitProxy) for example. These would be ignored in that case. However, I think that the application needs internet access anyway, so this could probably be disregarded.