How to use different github.com accounts in different vscode instances

Hello,

I have 2 github.com accounts (perso and work).
In order to use both under the same linux bash with git commands, I use the method described [here](https://vanthanhtran245.github.io/use-multiple-ssh-key-for-different-git-accounts/).

```config
# Personal GitHub account
Host github.com
HostName github.com
User git
AddKeysToAgent yes
UseKeychain yes
IdentityFile ~/.ssh/id_rsa

# Work GitHub account
Host github.com-work
HostName github.com
User git
AddKeysToAgent yes
UseKeychain yes
IdentityFile ~/.ssh/work_rsa
```

For personal githubom repos:
`git remote add origin git@github.com:[my work GitHub group]/[my project].git`

For work github.com repos:
`git remote add origin git@github.com-work:[my work GitHub group]/[my project].git`

With vscode, i can only authenticated to a single github.com account, is there an easier way to have both available ?

Start by reviewing the VS Code GitHub authentication behavior described in the issue and the vscode-github-actions extension documentation. Determine whether multiple github.com accounts across separate VS Code instances are supported; done should clearly document the supported workflow or confirm that the capability is unavailable.

索引モデルが issue の本文から書いたものです。