Non-interactive (without any user prompt) credential storage on Linux

[bairog]

I have Ubuntu 22.04.4 LTS distro on my WSL2 (hosted on my Windows 11 23H2 x64 Pro).
And I need to securely and persisently store credentials in non-interactive manner (without any user prompt).
Secret Service API definitelly require GUI, Git credential cache is not persistent, Plaintext files are not secure at all.
I've tried to use GPG/pass compatible files store. But if I set a passphrase for a generated GPG key a prompt starts to open in WSL2 terminal window (or in a GUI window if Seahorse is installed):

So GPG/pass compatible files don't require any interaction only if GPG key has no passphrase? No other options available on Linux?

[becm]

In case you trust the Git instance on your Windows system, you can redirect to its GCM credential store.
The credentials there are protected by the Windows login, so this still only secures data-at-rest.
Be careful with this approach when using worktrees.