I am using Helm 3 and when I run below command in Jenkins pipeline.

  + helm upgrade --install road-dashboard -f values.dev.yaml --namespace dev

I received an below error.

Error: "helm upgrade" requires 2 arguments

Probably I should specify chart name as well.But I have some confusion because of new for using Helm.

1.How should I specify the chart name. It has to be directory or any chart name that I can specify.My app tree structure as below.

 +-- helm\road-dashboard
    |       +--charts
    |       +-- templates
    |       |   \-- ...
    |       +-- Chart.yaml
    |       +-- values.dev.yaml     # dev override values
    |       +-- values.stage.yaml   # stage override values
    |       +-- values.prod.yaml    # production override values

2.I would like to run helm lint command before deployment.My helm chart directory in Jenkins:/home/ubuntu/workspace/road-dashboard/helm/road-dashboard. So what is the best practice to change directory only for helm lint command and return existing working directory for helm --upgrade install command which should be /home/ubuntu/workspace/road-dashboard. Below is the script that but not sure this is suitable for best practices.

        stage('Deploy to dev'){
        when{
            beforeAgent true
            expression{return env.GIT_BRANCH == "origin/develop"}
        }
        steps{
            dir('/home/ubuntu/workspace/road-dashboard/helm/road-dashboard'){
                sh "helm lint"
            }
            script{
                def namespace = "dev"
                def ENV = "dev"

                withCredentials([file(credentialsId: 'mbtkubeconfig', variable: 'config')]){

                    sh """
                        export KUBECONFIG=\${config}