This PR adds support for entering your git GPG passphrase through the
askpass UI. As a daily Zed user I'm really missing this feature, this
forces me to switch to a terminal or an external application. which is
not ideal for me and most people that are forced to use GPG signing.
Right now Zed can show a similar error (redacted) when you are trying to
commit with GPG signing enabled:
```
error: gpg failed to sign the data:
[GNUPG:] KEY_CONSIDERED <redacted> 2
[GNUPG:] BEGIN_SIGNING H8
[GNUPG:] PINENTRY_LAUNCHED 4625 curses 1.3.2 - xterm-ghostty - - 501/20 0
gpg: signing failed: Inappropriate ioctl for device
[GNUPG:] FAILURE sign <redacted>
gpg: signing failed: Inappropriate ioctl for device
fatal: failed to write commit object
```
Here is the key configurion parts of my **global** git config:
```
[user]
name = Remco Smits
email = <redacted>
signingkey = <redacted>
[commit]
gpgsign = true
[tag]
gpgsign = true
```
**Before**
https://github.com/user-attachments/assets/60a06574-92f1-45df-a29a-8ae11db6751d
**After**
https://github.com/user-attachments/assets/92b648e9-b538-4ce5-af4c-136689d14e1a
**How to test this?**
1. Create a key `gpg --full-generate-key`
2. Run `git config --global user.signingkey <KEY ID>`
3. Run `git config --global commit.gpgsign true`
4. Run & copy result from `gpg --armor --export <KEY ID>` and submit
your public key to github
[https://github.com/settings/gpg/new](https://github.com/settings/gpg/new)
5. Make a change and try committing
6. See that it promts for your passphrase :)
**Note**: I used AI as an assistant to write this PR
Self-Review Checklist:
- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [ ] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable
Release Notes:
- Git: Passphrase prompts from GPG to unlock commit signing keys are now
shown in Zed.
Co-authored-by: Lukas Wirth <lukas@zed.dev>
