gitlab: sign built packages

.gitlab-ci.yml

@@ -55,6 +55,13 @@ test:
     paths:
       - "target/site/jacoco/jacoco.xml"
 
+sign:
+  stage: publish
+  image: centos:8
+  script:
+    - ls -la
+
+
 #coverage-jdk11:
 #  # Must be in a stage later than test-jdk11's stage.
 #  # The `visualize` stage does not exist by default.
@@ -67,4 +74,4 @@ test:
 #  needs: ["test"]
 #  artifacts:
 #    reports:
-#      cobertura: target/site/cobertura.xml
\ No newline at end of file
+#      cobertura: target/site/cobertura.xml