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/tests/infra/with-test-db.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env sh
+
+# Example usage:
+# ./with-test-db.sh psql postgresql://pg:password@localhost:5433/postgres -c 'select 1;'
+
+dir=$(dirname $0)
+. ${dir}/_common.sh
+
+SERVICES="db_test" main "$@"