make sure pipelinerun is set on incoming webhooks

maybe we will do target-event incoming in the future but today is not
the day (and not documented)

Signed-off-by: Chmouel Boudjnah <chmouel@redhat.com>

docs/content/docs/guide/incoming_webhook.md

@@ -61,7 +61,7 @@ after setting this up, you will be able to trigger a PipelineRun called
 `https://github.com/owner/repo`. As an example here is the full curl snippet:
 
 ```shell
-curl -X POST https://control.pac.url/incoming?secret=very-secure-secret&repository=repo,branch=main
+curl -X POST https://control.pac.url/incoming?secret=very-secure-secret&repository=repo,branch=main&pipelinerun=target_pipelinerun
 ```
 
 note two things the `"/incoming"` path to the controller URL and the `"POST"`

pkg/adapter/incoming.go

@@ -30,8 +30,8 @@ func (l *listener) detectIncoming(ctx context.Context, req *http.Request, payloa
 	if req.URL.Path != "/incoming" {
 		return false, nil, nil
 	}
-	if repository == "" || querySecret == "" || branch == "" {
-		return false, nil, fmt.Errorf("missing query URL argument: branch, repository, secret: %+v",
+	if pipelineRun == "" || repository == "" || querySecret == "" || branch == "" {
+		return false, nil, fmt.Errorf("missing query URL argument: pipelinerun, branch, repository, secret: %+v",
 			req.URL.Query())
 	}