A bit more git commit signing

.github/workflows/release.yml

@@ -23,9 +23,14 @@ jobs:
           gpg-passphrase: PGP_PASSPHRASE
       - name: Configure git
         run: |
-          git config user.email "[email protected]"
-          git config user.name "Guardian Automated Maven Release"
+          key_fingerprint_and_email=$(gpg2 --list-secret-keys --list-options show-only-fpr-mbox)
+          key_fingerprint=$(echo $key_fingerprint_and_email | awk '{print $1}')
+          key_email=$(echo $key_fingerprint_and_email | awk '{print $2}')
+          
+          git config user.email "$key_email"
+          git config user.name "$GITHUB_ACTOR using Guardian Automated Maven Release"
           git config commit.gpgsign true
+          git config user.signingkey "$key_fingerprint"
       - name: Publish the release
         run: sbt "release with-defaults"
       - name: Create Github Release