Git Commit Signing: Unable to open allowed keys file

[MartinLoeper]

• VSCode Version: 1.87.2

• Local OS Version: NixOS Unstable

• Remote OS Version: NixOS Unstable

• Remote Extension/Connection Type: Containers

• Logs:

Good "git" signature with ECDSA-SK key SHA256:<redacted>
Unable to open allowed keys file "/home/node/.ssh/allowed_signers": No such file or directory
sig_find_principals: sshsig_get_principal: No such file or directory
No principal matched.

Steps to Reproduce:

1. create a signed commit in a git repo and configure allowed signers:

[gpg "ssh"]
  allowedsignersfile = "~/.ssh/allowed_signers"

2. open the repo using devcontainers extension

Does this issue occur when you try this locally?: No
Does this issue occur when you try this locally and all extensions are disabled?: No

It looks like the allowed_signers file is simply not copied over into the container. Can we make provide a devcontainer.json attribute or so to copy files which are required for git commit signing to work properly.

Possibly related to:

• SSH commit signing: handle local filepath in gitconfig #7796 @chrmarti

What is interesting though: Signing works as expected. It is only validation which looks like it's not supported yet.