ci: Update gitlab-ci.yml

.gitlab-ci.yml

-image: ci-nbxmpp:master
-
 stages:
-  - test
+  # - test
   - build
   - deploy
 
-test-pylint:
-  stage: test
-  script:
-    - python3 .ci/pylint-test.py
-    - coverage run --source=nbxmpp -m unittest discover -v
-    - coverage report -mi
-    - coverage xml -i
-    - pip install .
-  coverage: "/TOTAL.+ ([0-9]{1,3}%)/"
-  artifacts:
-    reports:
-      cobertura: coverage.xml
+# test-pylint:
+#   image: ci-gajim:master
+#   stage: test
+#   script:
+#     - python3 .ci/pylint-test.py
+#     - coverage run --source=nbxmpp -m unittest discover -v
+#     - coverage report -mi
+#     - coverage xml -i
+#     - pip install .
+#   coverage: "/TOTAL.+ ([0-9]{1,3}%)/"
+#   artifacts:
+#     reports:
+#       cobertura: coverage.xml
 
 build-linux:
+  image: nbxmpp-deb-build:latest
   stage: build
   script:
     - python3 setup.py sdist