added test stage

.gitlab-ci.yml

 image: alash325/javaant:latest
 stages:
   - build
+  - test
 build:
   stage: build
   script:
     - ant build
+test:
+  stage: test
+  script:
+    - ant -lib test/lib/junit.jar -Dtest=AllTests testall
   artifacts:
     paths:
-      - ./lab5.*
+      - ./build/report/index.html