GPG passphrase for GitHub Packages as well

Author: willhains

.github/workflows/maven-publish.yml

@@ -49,6 +49,7 @@ jobs:
       run: mvn deploy
       env:
         GITHUB_TOKEN: ${{ github.token }}
+        MAVEN_GPG_PASSPHRASE: ${{ secrets.MAVEN_GPG_PASSPHRASE }}
 
     - name: Set up Apache Maven Central
       uses: actions/setup-java@v2