Dev Containers mounts files as root instead of my user

[qidydl]

Type: Bug

I installed Docker Community Edition and followed the official Docker documentation for running in rootless mode (https://docs.docker.com/engine/security/rootless/). I then attempted to add a devcontainer to my repository. Everything works, except all of the files inside the container (under /workspaces) appear to be mounted and owned as root, which means unless I set remoteUser to root, I cannot make any changes. How can I get VSCode/devcontainers to mount the files as the same vscode user that it uses inside the container? Setting the containerUser property did not work.

VS Code version: Code 1.96.2 (fabdb6a, 2024-12-19T10:22:47.216Z)
OS version: Linux x64 6.11.0-13-generic snap
Modes:

System Info

Item	Value
CPUs	AMD Ryzen 7 2700X Eight-Core Processor (16 x 4141)
GPU Status	2d_canvas: unavailable_software canvas_oop_rasterization: disabled_off direct_rendering_display_compositor: disabled_off_ok gpu_compositing: disabled_software multiple_raster_threads: enabled_on opengl: disabled_off rasterization: disabled_software raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: disabled_software video_encode: disabled_software vulkan: disabled_off webgl: unavailable_software webgl2: unavailable_software webgpu: disabled_off webnn: unavailable_software
Load (avg)	1, 1, 1
Memory (System)	15.46GB (10.88GB free)
Process Argv	--no-sandbox --force-user-env --crash-reporter-id bb1c73ce-4ea6-46ad-8106-89003d24d57a
Screen Reader	no
VM	0%
DESKTOP_SESSION	plasma
XDG_CURRENT_DESKTOP	KDE
XDG_SESSION_DESKTOP	KDE
XDG_SESSION_TYPE	wayland

Extensions (16)

Extension	Author (truncated)	Version
language-hugo-vscode	bud	1.3.1
githistory	don	0.6.20
xml	Dot	2.5.1
codespaces	Git	1.17.3
gc-excelviewer	Gra	4.2.62
vscode-docker	ms-	1.29.3
debugpy	ms-	2024.14.0
isort	ms-	2023.10.1
python	ms-	2024.22.1
vscode-pylance	ms-	2024.12.1
remote-containers	ms-	0.394.0
hexeditor	ms-	1.11.1
wasm-wasi-core	ms-	1.0.2
vscode-yaml	red	1.15.0
code-spell-checker	str	4.0.21
vscode-icons	vsc	12.10.0

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[qidydl]

The repository I am working out of: https://github.com/qidydl/wadny

Note how I have to specify "remoteUser": "root" in devcontainer.json because all the files inside the container get mounted as root. I want to change how /workspaces is mounted so I don't have to do this.