treewide: fix %v in cases where we should use %w

We should always use %w when using fmt.Errorf as you can use error.Is to
compare the underlying error. When printing an error the use of %w is
wrong and should be replaced with %v.

Change-Id: I741111bd91dcee4099144d2ecaffa879fdbb34a2
Reviewed-on: https://review.monogon.dev/c/monogon/+/2993
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/metropolis/node/kubernetes/containerd/main.go b/metropolis/node/kubernetes/containerd/main.go
index 6782137..bb7e140 100644
--- a/metropolis/node/kubernetes/containerd/main.go
+++ b/metropolis/node/kubernetes/containerd/main.go
@@ -83,7 +83,7 @@
 				// is not an issue for us.
 				time.Sleep(10 * time.Millisecond)
 			} else if err != nil {
-				return fmt.Errorf("log pump failed: %v", err)
+				return fmt.Errorf("log pump failed: %w", err)
 			}
 		}
 	}