Add --memory option to paasta local-run to allow overriding of memory…

… limit set in yelpsoa-configs.

paasta_tools/cli/cmds/local_run.py

@@ -386,6 +386,16 @@ def add_subparser(subparsers):
         required=False,
         default=None,
     )
+    list_parser.add_argument(
+        "--memory",
+        help=(
+            "Specify a memory limit (in megabytes) for the container."
+            " If not specified, the memory limit is pulled from yelpsoa-configs for your --instance/--cluster."
+        ),
+        required=False,
+        default=None,
+        type=int,
+    )
     list_parser.add_argument(
         "-i",
         "--instance",
@@ -1174,6 +1184,9 @@ def configure_and_run_docker_container(
         )
         return 1
 
+    if args.memory:
+        instance_config.config_dict["mem"] = args.memory
+
     if docker_sha is not None:
         instance_config.branch_dict = {
             "git_sha": docker_sha,