Support for signed commits

[jonesbusy]

What feature do you want to see added?

SInce JGit version 7.1 it support SSH keys signing.

Perhaps it could be the easiest solution rather than using GPG signing

To investigate

Upstream changes

No response

[jonesbusy]

Will be probably one of my next task.

Some plugin require signed commits : jenkinsci/token-macro-plugin#239

[gounthar]

Would it be possible to include instructions in the documentation on how users can configure their SSH key for this tool?
The message is somehow misleading.

Before setting my git client to use signed by ssh commits:

java -jar plugin-modernizer-cli/target/jenkins-plugin-modernizer-999999-SNAPSHOT.jar run --plugins absint-a3 --recipe SetupJenkinsfile
[...]
Can only sign commit using SSH key. Skipping sign commit when using GH_TOKEN
Failed to commit changes
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Plugin: absint-a3
Error: Failed to commit changes
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After removing GH_TOKEN:

unset GH_TOKEN
java -jar plugin-modernizer-cli/target/jenkins-plugin-modernizer-999999-SNAPSHOT.jar run --plugins absint-a3 --recipe SetupJenkinsfile
Run Plugin Modernizer
Validation error
Please set GH_TOKEN, GITHUB_TOKEN or configure GitHub app authentication.

After setting once again GH_TOKEN and setting up an ssh key:

java -jar plugin-modernizer-cli/target/jenkins-plugin-modernizer-999999-SNAPSHOT.jar run --plugins absint-a3 --recipe SetupJenkinsfile
[...]
Can only sign commit using SSH key. Skipping sign commit when using GH_TOKEN
Pushed changes to forked repository for plugin absint-a3
Pull request created: https://github.com/jenkinsci/absint-a3-plugin/pull/3
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Plugin: absint-a3
Pull request was open on https://github.com/jenkinsci/absint-a3-plugin
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