user id issues on Linux with vscode vs ubuntu user

Hi,
not sure if it is fixable in this repository or should be reported somewhere else. Just wanted to document the issue if others encounter it and reduce their time spent troubleshooting.

Using the devcontainer template with image swift:6.1 on Linux with a host user/group ID of 1000 will enter the devcontainer as user vscode with user/group ID of 1001, resulting in permission issues for any file changes.

vscode ➜ /workspaces/new $ id
uid=1001(vscode) gid=1001(vscode) groups=1001(vscode)
vscode ➜ /workspaces/new $ touch test
touch: cannot touch 'test': Permission denied

There is an existing user ubuntu in the container with the ID 1000.

vscode ➜ /workspaces/new $ getent passwd ubuntu
ubuntu:x:1000:1000:Ubuntu:/home/ubuntu:/bin/bash

Changing the devcontainer.json template to user ubuntu resolves the permission issues.

...
"username": "ubuntu",
...
"remoteUser": "ubuntu"

ubuntu ➜ /workspaces/new $ id
uid=1000(ubuntu) gid=1000(ubuntu) groups=1000(ubuntu),4(adm),20(dialout),24(cdrom),25(floppy),27(sudo),29(audio),30(dip),44(video),46(plugdev)

Comparing it with other devcontainer templates the user id for vscode is 1000 and no changes need to be made in the template.
E.g. Go

vscode ➜ /workspaces/container $ id
uid=1000(vscode) gid=1000(vscode) groups=1000(vscode),998(nvm),999(golang)

The report points to the devcontainer.json template and the swift:6.1 image; reproduce on Linux with host UID/GID 1000 and inspect how username and remoteUser are selected. Done means the resulting container user matches the host ID and can create files in /workspaces without permission errors.