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/routes/util.ts

@@ -0,0 +1,23 @@
+import {ErrorRequestHandler, Request, RequestHandler, Response} from 'express'
+
+import {httpLogger} from '../logger.js'
+
+export type Handler = (req: Request, res: Response) => Awaited<void>
+
+export const handler = (runHandler: Handler): RequestHandler => {
+  return async (req, res, next) => {
+    try {
+      await runHandler(req, res)
+    } catch (err) {
+      next(err)
+    }
+  }
+}
+
+export const errorHandler: ErrorRequestHandler = (err, _req, res, next) => {
+  httpLogger.error({err}, 'request error')
+  if (res.headersSent) {
+    return next(err)
+  }
+  return res.status(500).end('server error')
+}