Add StartOS 0.4 package scaffold (manifest, main, interfaces, 2 actions)

- package/Makefile + s9pk.mk + package.json + tsconfig.json
- startos/manifest: dockerBuild source pointing at ../image/Dockerfile
- startos/main: reads /data/config.yaml reactively, passes env vars to container
- startos/interfaces: binds port 9999 as HTTP UI
- startos/actions: showPublicKey (read /data/ssh/id_ed25519.pub), configureSparks
- TS + JS bundle compile clean (tsc --noEmit, ncc build)

package/startos/index.ts

@@ -0,0 +1,11 @@
+/**
+ * Plumbing. DO NOT EDIT.
+ */
+export { createBackup } from './backups'
+export { main } from './main'
+export { init, uninit } from './init'
+export { actions } from './actions'
+import { buildManifest } from '@start9labs/start-sdk'
+import { manifest as sdkManifest } from './manifest'
+import { versionGraph } from './versions'
+export const manifest = buildManifest(versionGraph, sdkManifest)