treewide: add missing error handling

Change-Id: I55ccf3ff490b58f6af93e665c668428acddc8d65
Reviewed-on: https://review.monogon.dev/c/monogon/+/3019
Vouch-Run-CI: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
Reviewed-by: Serge Bazanski <serge@monogon.tech>
diff --git a/cloud/shepherd/provider/equinix/updater_test.go b/cloud/shepherd/provider/equinix/updater_test.go
index 9b23295..e400690 100644
--- a/cloud/shepherd/provider/equinix/updater_test.go
+++ b/cloud/shepherd/provider/equinix/updater_test.go
@@ -102,6 +102,9 @@
 			AgentPublicKey: []byte("fakefakefakefake"),
 		})
 	})
+	if err != nil {
+		t.Fatalf("failed to execute bmdb transaction: %v", err)
+	}
 
 	deadline := time.Now().Add(time.Second * 10)
 	for {