fix(pkgctl): make sure git signing uses PGP

Chih-Hsuan Yenrequested to merge
yan12125/devtools:git-gpg-format into master

Component: pkgctl repo configure

I switched to SSH for git signing with git config --global gpg.format ssh and git config --global user.signingkey "key::ssh-ed25519 foobar". Now git commit in a package fails with:

error: Couldn't load public key barfoo: No such file or directory?

fatal: failed to write commit object

(All key IDs redacted)

I'm not sure if GIT_REPO_SPEC_VERSION should be bumped for this change or not.

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