Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -7,7 +7,7 @@ run tests:
     stage: test
     image: docker
     variables:
-      DOCKERFILE_PATH: ./docker/Test
+      DOCKERFILE_PATH: ./docker/Dockerfile.Test
       CI_IMAGE_NAME: "webhook-manager-tests"
     script:
         - docker build -t "$CI_IMAGE_NAME:$CI_COMMIT_SHORT_SHA" -f $DOCKERFILE_PATH .