Update GitHub workflow to publish to Maven Central

Author: cketti

.github/workflows/release.yaml

@@ -18,6 +18,9 @@ jobs:
         with:
           distribution: 'zulu'
           java-version: 19
-
-      # TODO:
-      #- run: ./gradlew build publish
+      - name: Build and publish artifacts
+        env:
+          ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.MAVEN_CENTRAL_USERNAME }}
+          ORG_GRADLE_PROJECT_mavenCentralPassword: ${{ secrets.MAVEN_CENTRAL_PASSWORD }}
+          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.SIGNING_KEY }}
+        run: ./gradlew build publish