[feature] persist worker queues to db (#3042)

* persist queued worker tasks to database on shutdown, fill worker queues from database on startup

* ensure the tasks are sorted by creation time before pushing them

* add migration to insert WorkerTask{} into database, add test for worker task persistence

* add test for recovering worker queues from database

* quick tweak

* whoops we ended up with double cleaner job scheduling

* insert each task separately, because bun is throwing some reflection error??

* add specific checking of cancelled worker contexts

* add http request signing to deliveries recovered from database

* add test for outgoing public key ID being correctly set on delivery

* replace select with Queue.PopCtx()

* get rid of loop now we don't use it

* remove field now we don't use it

* ensure that signing func is set

* header values weren't being copied over 🤦

* use ptr for httpclient.Request in delivery

* move worker queue filling to later in server init process

* fix rebase issues

* make logging less shouty

* use slices.Delete() instead of copying / reslicing

* have database return tasks in ascending order instead of sorting them

* add a 1 minute timeout to persisting worker queues

internal/httpclient/request.go

@@ -47,8 +47,8 @@ type Request struct {
 
 // WrapRequest wraps an existing http.Request within
 // our own httpclient.Request with retry / backoff tracking.
-func WrapRequest(r *http.Request) Request {
-	var rr Request
+func WrapRequest(r *http.Request) *Request {
+	rr := new(Request)
 	rr.Request = r
 	entry := log.WithContext(r.Context())
 	entry = entry.WithField("method", r.Method)