MDBF-1076: MSAN Debug builder master.cfg

Author: grooverdan

master-migration/master.cfg

@@ -278,14 +278,16 @@ for builder in ["amd64-ubasan-clang-20", "amd64-ubasan-clang-20-debug"]:
 
 def msan_builder(name: str, debug: bool) -> GenericBuilder:
     tags_msan = ("Debian", "clang", "msan", "big")
+    jobs = 12
     if debug:
         tag_msan = tags_msan + ("debug",)
+        jobs = 6
 
     return GenericBuilder(
         name=name,
         sequences=[
             msan(
-                jobs=12,
+                jobs=jobs,
                 config=DockerConfig(
                     repository=os.environ["CONTAINER_REGISTRY_URL"],
                     image_tag="debian12-msan-clang-20",
@@ -309,14 +311,13 @@ def msan_builder(name: str, debug: bool) -> GenericBuilder:
         next_build=nextBuild,
         can_start_build=canStartBuild,
         tags=list(tags_msan),
-        jobs=12,
+        jobs=jobs,
     )
 
 
 builder = "amd64-msan-clang-20-debug"
 c["builders"].append(msan_builder(name=builder, debug=builder.endswith("debug")))
 
-
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