Add secrets for Maven Central deployment to release workflow

Author: Splatcrafter

.github/workflows/release.yml

@@ -125,6 +125,8 @@ jobs:
 
       - name: Deploy to Maven Central
         env:
+          CENTRAL_USERNAME: ${{ secrets.CENTRAL_USERNAME }}
+          CENTRAL_TOKEN: ${{ secrets.CENTRAL_TOKEN }}
           MAVEN_GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
         run: mvn -B clean deploy -Prelease -DskipTests -Dgpg.useAgent=false