Upgrade the release script

Author: reda-alaoui

release.sh

@@ -1,2 +1,4 @@
 #!/usr/bin/env bash
+# Prime gpg-agent caches. See https://maven.apache.org/plugins/maven-gpg-plugin/usage.html
+echo "test" | gpg --clearsign > /dev/null
 ./mvnw --batch-mode clean release:prepare release:perform && git push && git push --tags