ci/lava: add main() function to fix entry point

Signed-off-by: Vignesh Raman <vignesh.raman@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35961>

.gitlab-ci/lava/lava_job_submitter.py

@@ -609,7 +609,7 @@ class StructuredLoggerWrapper:
         return context
 
 
-if __name__ == "__main__":
+def main():
     # given that we proxy from DUT -> LAVA dispatcher -> LAVA primary -> us ->
     # GitLab runner -> GitLab primary -> user, safe to say we don't need any
     # more buffering
@@ -617,3 +617,6 @@ if __name__ == "__main__":
     sys.stderr.reconfigure(line_buffering=True)
 
     fire.Fire(LAVAJobSubmitter)
+
+if __name__ == "__main__":
+    main()