git-artifacts: correct the packager information of the Pacman packages

We currently use a bogus `PACKAGER` information that is derived from the
`${{ github.actor }}`, which is the GitForWindowsHelper GitHub App.
Since we're already using my personal GPG key to sign those packages,
might just as well use my name as the packager, too.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.github/workflows/git-artifacts.yml

@@ -266,7 +266,8 @@ jobs:
           echo '${{secrets.PRIVGPGKEY}}' | tr % '\n' | gpg $GPG_OPTIONS --import &&
           info="$(gpg --list-keys --with-colons "${GPGKEY%% *}" | cut -d : -f 1,10 | sed -n '/^uid/{s|uid:||p;q}')" &&
           git config --global user.name "${info% <*}" &&
-          git config --global user.email "<${info#*<}"
+          git config --global user.email "<${info#*<}" &&
+          echo "PACKAGER=$info" >>$GITHUB_ENV
         env:
           GPGKEY: ${{secrets.GPGKEY}}
       - name: update check-run