Unable to commit and sign because of GPG signing error in devcontainer

Hello,
I'm opening this issue because I'm unable to commit and sign my commit with GPG key in devcontainer.

error: gpg failed to sign the data
fatal: failed to write commit object

On my host (Windows) I have Kleopatra (Gpg4win-4.4.1) installed and my key is visible in the GUI.
Then I have followed the step from this documentation : https://code.visualstudio.com/remote/advancedcontainers/sharing-git-credentials#_sharing-gpg-keys and add gnupg in the dockerfile of my devcontainer.

After rebuilding the devcontainer without cache I still can't use my gpg key.
In the devcontainer I see this :

# gpg --list-secret-keys
gpg: keybox '/root/.gnupg/pubring.kbx' created
gpg: /root/.gnupg/trustdb.gpg: trustdb created
# gpg --list-secret-keys
# 

I also tried to run this command on the host : gpg-disable-keyboxd to restore the old format for gnupg but it's the same.

Moreover I can see this in the log in the devcontainer :

[51058 ms] Start: Run in container: gpgconf --list-dirs
[51062 ms] sysconfdir:/etc/gnupg
bindir:/usr/bin
libexecdir:/usr/lib/gnupg
libdir:/usr/lib/x86_64-linux-gnu/gnupg
datadir:/usr/share/gnupg
localedir:/usr/share/locale
socketdir:/root/.gnupg
dirmngr-socket:/root/.gnupg/S.dirmngr
agent-ssh-socket:/root/.gnupg/S.gpg-agent.ssh
agent-extra-socket:/root/.gnupg/S.gpg-agent.extra
agent-browser-socket:/root/.gnupg/S.gpg-agent.browser
agent-socket:/root/.gnupg/S.gpg-agent
homedir:/root/.gnupg
[51062 ms] 
[51063 ms] Start: Run in container: ls '/root/.gnupg/private-keys-v1.d' 2>/dev/null
[51066 ms] 
[51066 ms] 
[51067 ms] Exit code 2
[51067 ms] Start: Run in Host: gpgconf --list-dirs
[51074 ms] sysconfdir:/etc/gnupg
bindir:/usr/bin
libexecdir:/usr/lib/gnupg
libdir:/usr/lib/x86_64-linux-gnu/gnupg
datadir:/usr/share/gnupg
localedir:/usr/share/locale
socketdir:/run/user/1000/gnupg
dirmngr-socket:/run/user/1000/gnupg/S.dirmngr
keyboxd-socket:/run/user/1000/gnupg/S.keyboxd
agent-ssh-socket:/run/user/1000/gnupg/S.gpg-agent.ssh
agent-extra-socket:/run/user/1000/gnupg/S.gpg-agent.extra
agent-browser-socket:/run/user/1000/gnupg/S.gpg-agent.browser
agent-socket:/run/user/1000/gnupg/S.gpg-agent
homedir:/home/ubuntu/.gnupg
[51074 ms] 
[51078 ms] Start: Run in container: test -f '/root/.gnupg/pubring.kbx'
[51081 ms] 
[51081 ms] 
[51081 ms] Exit code 1
[51081 ms] Start: Run in container: test -f '/root/.gnupg/pubring.gpg'
[51083 ms] 
[51083 ms] 
[51083 ms] Exit code 1
[51084 ms] Start: Run in container: test -f '/root/.gnupg/trustdb.gpg'
[51086 ms] 
[51086 ms] 
[51086 ms] Exit code 1
[51086 ms] Start: Run in container: mkdir -p -m 700 '/root/.gnupg'
[51086 ms] gpg-agent: Socket in container (/root/.gnupg/S.gpg-agent) forwarded to wsl host (/run/user/1000/gnupg/S.gpg-agent.extra).
[52538 ms] 
[52538 ms] 
[52538 ms] Start: Run in container: (command -v 'docker' || command -v 'oras' || command -v 'skopeo') >/dev/null 2>&1
[52541 ms] 
[52542 ms] 
[52542 ms] Start: Run in Host: docker exec -i -u root 7631a3e823a46bf729134f84c8565d421c253f15d928fb1c8e59308ebeeaf197 /bin/sh
[52542 ms] userEnvProbe: loginInteractiveShell (default)
[52543 ms] Start: Run in container: test -f '/tmp/devcontainers-b7603ad0-25e6-400b-97b5-84857ac4bf7a1765803211341/env-loginInteractiveShell.json'
[52549 ms] Start: Run in container: echo ~
[52551 ms] 
[52552 ms] 
[52552 ms] Exit code 1
[52552 ms] userEnvProbe: not found in cache
[52552 ms] userEnvProbe shell: /bin/bash
[52555 ms] Start: Run in container: # Test for /root/.ssh/known_hosts and ssh
[52558 ms] Start: Run in Host: gpg-connect-agent updatestartuptty /bye
[52562 ms] 
[52562 ms] 

Here is my version of VSCode :

Version: 1.107.0 (user setup)
Commit: 618725e67565b290ba4da6fe2d29f8fa1d4e3622
Date: 2025-12-10T07:43:47.883Z
Electron: 39.2.3
ElectronBuildId: 12895514
Chromium: 142.0.7444.175
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.22631

Extensions versionning :

• Remote development : 0.26.0
• Dev Containers : v0.434.0
• Remote - SSH : v0.122.0
• Remote - Tunnels : v1.5.3
• WSL : v0.104.3

Docker desktop version v4.54.0 with Use the WSL 2 based engine enabled

How can I solve this issue ?
Thank you very much for your help.

Best regards,