[DO NOT MERGE] Always trace

Author: jieyouxu

src/bootstrap/bootstrap.py

@@ -1130,8 +1130,9 @@ def build_bootstrap_cmd(self, env):
         ]
         args.extend("--verbose" for _ in range(self.verbose))
 
-        if "BOOTSTRAP_TRACING" in env:
-            args.append("--features=tracing")
+        #if "BOOTSTRAP_TRACING" in env:
+        args.append("--features=tracing")
+        env["BOOTSTRAP_TRACING"] = "bootstrap=trace"
 
         if self.use_locked_deps:
             args.append("--locked")