Add GPG key

Author: ben221199

.github/workflows/maven-publish.yml

@@ -20,6 +20,7 @@ jobs:
         with:
           java-version: '11'
           distribution: 'temurin'
+          gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }}
           server-id: ossrh
           server-username: MAVEN_USERNAME
           server-password: MAVEN_PASSWORD
@@ -33,6 +34,7 @@ jobs:
         with:
           java-version: '11'
           distribution: 'temurin'
+          gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }}
       - name: Publish to GitHub Packages
         run: mvn --batch-mode deploy
         env: