fix: stabilize software updates

internal/updateagent/docker.go

@@ -304,8 +304,8 @@ func (c *dockerClient) findTarget(ctx context.Context, label string) (containerS
 	return running[0], nil
 }
 
-func (c *dockerClient) pullImage(ctx context.Context, repository, tag, username, token string) error {
-	authJSON, _ := json.Marshal(map[string]string{"username": username, "password": token, "serveraddress": strings.Split(repository, "/")[0]})
+func (c *dockerClient) pullImage(ctx context.Context, repository, tag, username, credential string) error {
+	authJSON, _ := json.Marshal(map[string]string{"username": username, "password": credential, "serveraddress": strings.Split(repository, "/")[0]})
 	headers := http.Header{"X-Registry-Auth": {base64.URLEncoding.EncodeToString(authJSON)}}
 	query := url.Values{"fromImage": {repository}, "tag": {tag}}
 	response, err := c.request(ctx, http.MethodPost, "/images/create?"+query.Encode(), nil, headers, true)