Feature/subcontainers (#2720)

* wip: subcontainers

* wip: subcontainer infra

* rename NonDestroyableOverlay to SubContainerHandle

* chore: Changes to the container and other things

* wip:

* wip: fixes

* fix launch & exec

Co-authored-by: Jade <Blu-J@users.noreply.github.com>

* tweak apis

* misc fixes

* don't treat sigterm as error

* handle health check set during starting

---------

Co-authored-by: J H <dragondef@gmail.com>
Co-authored-by: Jade <Blu-J@users.noreply.github.com>

sdk/lib/StartSdk.ts

@@ -61,7 +61,7 @@ import {
 } from "./util/getServiceInterface"
 import { getServiceInterfaces } from "./util/getServiceInterfaces"
 import { getStore } from "./store/getStore"
-import { CommandOptions, MountOptions, Overlay } from "./util/Overlay"
+import { CommandOptions, MountOptions, SubContainer } from "./util/SubContainer"
 import { splitCommand } from "./util/splitCommand"
 import { Mounts } from "./mainFn/Mounts"
 import { Dependency } from "./Dependency"
@@ -734,8 +734,11 @@ export async function runCommand<Manifest extends T.Manifest>(
   },
 ): Promise<{ stdout: string | Buffer; stderr: string | Buffer }> {
   const commands = splitCommand(command)
-  return Overlay.with(effects, image, options.mounts || [], (overlay) =>
-    overlay.exec(commands),
+  return SubContainer.with(
+    effects,
+    image,
+    options.mounts || [],
+    (subcontainer) => subcontainer.exec(commands),
   )
 }
 function nullifyProperties(value: T.SdkPropertiesReturn): T.PropertiesReturn {