fix: address verified review findings (actions-runs-1)

Signed-off-by: bircni <bircni@icloud.com>

internal/app/target.go

@@ -356,6 +356,11 @@ func (a *application) selectHost(t *target, s settings.Snapshot) error {
 		}
 		t.Host, t.HostSource = explicit, "--host"
 	}
+	return a.defaultHost(t, s)
+}
+
+// defaultHost picks the instance of a target that neither the repository nor --host named.
+func (a *application) defaultHost(t *target, s settings.Snapshot) error {
 	if t.Host == "" {
 		for _, key := range []string{"TEA_HOST", "GITEA_INSTANCE_URL"} {
 			if value := a.deps.Getenv(key); value != "" {