Add Init API field documentation to swagger

Signed-off-by: Noah Meyerhans <nmeyerha@amazon.com>
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
Upstream-commit: 467ea71e5e2a0142c1456e3280d69a9538402fec
Component: engine

components/engine/api/swagger.yaml

@@ -443,6 +443,10 @@ definitions:
       OomKillDisable:
         description: "Disable OOM Killer for the container."
         type: "boolean"
+      Init:
+        description: "Run an init inside the container that forwards signals and reaps processes. This field is omitted if empty, and the default (as configured on the daemon) is used."
+        type: "boolean"
+        x-nullable: true
       PidsLimit:
         description: "Tune a container's pids limit. Set -1 for unlimited."
         type: "integer"