Add retry option to the ci-job tests

.gitlab-ci.yml

@@ -158,6 +158,7 @@ test:gcc8:opt:
       - ${TESTS_REPORT}
     when: always
     expire_in: 1 week
+  retry: 2
 
 test:gcc9:opt:
   stage: test
@@ -175,6 +176,7 @@ test:gcc9:opt:
       - ${TESTS_REPORT}
     when: always
     expire_in: 1 week
+  retry: 2
 
 test:gcc9:dbg:
   stage: test
@@ -192,6 +194,7 @@ test:gcc9:dbg:
       - ${TESTS_REPORT}
     when: always
     expire_in: 1 week
+  retry: 2
 
 test:gcc9:opt:python3:
   stage: test
@@ -209,6 +212,7 @@ test:gcc9:opt:python3:
       - ${TESTS_REPORT}
     when: always
     expire_in: 1 week
+  retry: 2
 
 test_public_headers_build:
   stage: test