Merge branch 'ci' into 'main'

Init CI tests with very basic import test.

See merge request ADLR/megatron-lm!224

.gitlab-ci.yml

+image: gitlab-master.nvidia.com/dl/dgx/pytorch:20.12-py3-devel
+
+test:
+  script:
+    - pytest --junitxml=report.xml tests
+  artifacts:
+    when: always
+    reports:
+      junit: report.xml
+    
\ No newline at end of file

tests/test_basic.py

+def test_import():
+    import megatron
+