outposts: set sentry-trace on API requests to match them to the outer transaction

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

internal/outpost/ak/http_tracing.go

@@ -20,6 +20,7 @@ func NewTracingTransport(ctx context.Context, inner http.RoundTripper) *tracingT
 
 func (tt *tracingTransport) RoundTrip(r *http.Request) (*http.Response, error) {
 	span := sentry.StartSpan(tt.ctx, "authentik.go.http_request")
+	r.Header.Set("sentry-trace", span.ToSentryTrace())
 	span.Description = fmt.Sprintf("%s %s", r.Method, r.URL.String())
 	span.SetTag("url", r.URL.String())
 	span.SetTag("method", r.Method)