Declare the built p2 repo as an artifact for the testing stage

.gitlab-ci.yml

@@ -33,6 +33,9 @@ build:
     - git submodule update --remote --recursive --init
   script:
     - mvn $MAVEN_CLI_OPTS $MAVEN_BUILD_OPTS verify
+  artifacts:
+    paths:
+      - releng/org.fortiss.af3.update/target/repository/
 
 test:
   stage: test