Bsky short link service (#4542)

* bskylink: scaffold service w/ initial config and schema

* bskylink: implement link creation and redirects

* bskylink: tidy

* bskylink: tests

* bskylink: tidy, add error handler

* bskylink: add dockerfile

* bskylink: add build

* bskylink: fix some express plumbing

* bskyweb: proxy fallthrough routes to link service redirects

* bskyweb: build w/ link proxy

* Add AASA to bskylink (#4588)

---------

Co-authored-by: Hailey <me@haileyok.com>

bskylink/src/db/schema.ts

@@ -0,0 +1,17 @@
+import {Selectable} from 'kysely'
+
+export type DbSchema = {
+  link: Link
+}
+
+export interface Link {
+  id: string
+  type: LinkType
+  path: string
+}
+
+export enum LinkType {
+  StarterPack = 1,
+}
+
+export type LinkEntry = Selectable<Link>