fix(cli): Make datahub quickstart work with latest docker compose in …

…M1 (#6891)

Co-authored-by: Harshal Sheth <hsheth2@gmail.com>

metadata-ingestion/src/datahub/cli/docker_cli.py

@@ -71,15 +71,8 @@ class Architectures(Enum):
 
 @functools.lru_cache()
 def _docker_subprocess_env() -> Dict[str, str]:
-    try:
-        DOCKER_COMPOSE_PLATFORM: Optional[str] = (
-            subprocess.run(["uname", "-m"], stdout=subprocess.PIPE)
-            .stdout.decode("utf-8")
-            .rstrip()
-        )
-    except FileNotFoundError:
-        # On Windows, uname is not available.
-        DOCKER_COMPOSE_PLATFORM = None
+    # platform.machine() is equivalent to `uname -m`, as per https://stackoverflow.com/a/45124927/5004662
+    DOCKER_COMPOSE_PLATFORM: str = "linux/" + platform.machine()
 
     env = {
         **os.environ,