dashboard/api: better error description

"error: api request "https://syzkaller.appspot.com/text?json=1&tag=ReproC&x=11003952980000" failed: 500 (%!w(<nil>))"
We have a 500 error w/o explanation.
Let's dump some body here.

1 files changed, 2 insertions, 1 deletions

diff --git a/dashboard/api/client.go b/dashboard/api/client.go
index b2ad3a3d4..8bf204e72 100644
--- a/dashboard/api/client.go
+++ b/dashboard/api/client.go
@@ -106,7 +106,8 @@ func (c *Client) Text(query string) ([]byte, error) {
 	defer res.Body.Close()
 	body, err := io.ReadAll(res.Body)
 	if res.StatusCode < 200 || res.StatusCode >= 300 || err != nil {
-		return nil, fmt.Errorf("api request %q failed: %v (%w)", queryURL, res.StatusCode, err)
+		return nil, fmt.Errorf("api request %q failed: status(%v) err(%w) body(%.1024s)",
+			queryURL, res.StatusCode, err, string(body))
 	}
 	return body, nil
 }