code run on TFE (Terraform Enterprise) shows error "Permission denied" on .sh scripts

[ehsanhub]

when running the code on Private Terraform Enterprise workspace that spins up a container for each terraform apply if (Skip Provisioner is false) I am getting permission error as below
hence upstream nameserver and other dependent config is broken

Initializing plugins and modules...
2020/06/11 14:25:29 [DEBUG] Using modified User-Agent: Terraform/0.12.24 TFE/v202004-2
module.lt-gke-sbx01.null_resource.wait_for_cluster[0]: Creating...
module.lt-gke-sbx01.null_resource.wait_for_cluster[0]: Provisioning with 'local-exec'...
module.lt-gke-sbx01.null_resource.wait_for_cluster[0] (local-exec): Executing: ["/bin/sh" "-c" "kubernetes-engine/modules/beta-private-cluster/scripts/wait-for-cluster.sh project cluster"]
module.lt-gke-sbx01.null_resource.wait_for_cluster[0] (local-exec): /bin/sh: 1: kubernetes-engine/modules/beta-private-cluster/scripts/wait-for-cluster.sh: Permission denied

module.lt-gke-sbx01.null_resource.delete_default_kube_dns_configmap[0]: Creating...
module.lt-gke-sbx01.null_resource.delete_default_kube_dns_configmap[0]: Provisioning with 'local-exec'...
module.lt-gke-sbx01.null_resource.delete_default_kube_dns_configmap[0] (local-exec): Executing: ["/bin/sh" "-c" "kubernetes-engine/modules/beta-private-cluster/scripts/kubectl_wrapper.sh https://10.10.10.1
module.lt-gke-sbx01.null_resource.delete_default_kube_dns_configmap[0] (local-exec): /bin/sh: 1: kubernetes-engine/modules/beta-private-cluster/scripts/kubectl_wrapper.sh: Permission denied

[ehsanhub]

I could fix the issue by add /bin/bash to null resource command = /bin/bash on the cluster.tf code
now need to install gcloud sdk for this script on tfe ws

[bharathkkb]

@ehsanhub I dont have much experience with TFE but we are looking into #404 which should help with installing gcloud.