ci: Add 1 retry to the CI jobs that run integration tests

Author: JanEbbing

.gitlab-ci.yml

@@ -45,6 +45,7 @@ build:
 test:
   stage: test
   extends: .test
+  retry: 1
   parallel:
     matrix:
       - DOCKER_IMAGE: "eclipse-temurin:18"
@@ -80,6 +81,7 @@ test:
 test_examples:
   stage: test
   extends: .test
+  retry: 1
   parallel:
     matrix:
       - DOCKER_IMAGE: "maven:3.8"