Add Terraform configuration and upgrade helm version (#1194)

* Use terraform to manage ci cluster. Upgrade ci cluster to 1.13
* Upgrade helm version
* Do not break the test if no previous resources
* Do not skip install helm if helm is old version

test/cluster/main.tf

@@ -0,0 +1,51 @@
+terraform {
+  backend "gcs" {
+    bucket = "fission-terraform-state"
+    prefix = "fission-ci-cluster"
+  }
+}
+
+provider "google" {
+  version = "~> 2.7"
+  project = "fission-ci"
+}
+
+resource "google_container_cluster" "fission-ci-1" {
+  name                     = "fission-ci-1"
+  description              = ""
+  min_master_version       = "1.13.6-gke.0"
+  network                  = "projects/fission-ci/global/networks/default"
+  location                 = "us-central1-a"
+  remove_default_node_pool = true
+  initial_node_count       = 0
+  logging_service          = "none"
+  monitoring_service       = "none"
+  master_authorized_networks_config {}
+}
+
+resource "google_container_node_pool" "pool-v1" {
+  name     = "pool-v1"
+  location = "us-central1-a"
+  cluster  = google_container_cluster.fission-ci-1.name
+
+  node_config {
+    machine_type = "n1-standard-2"
+    preemptible  = false
+    disk_size_gb = 100
+    oauth_scopes = [
+      "https://www.googleapis.com/auth/devstorage.read_only",
+      "https://www.googleapis.com/auth/monitoring.write",
+    ]
+  }
+
+  initial_node_count = 3
+  autoscaling {
+    min_node_count = 3
+    max_node_count = 5
+  }
+
+  management {
+    auto_repair  = true
+    auto_upgrade = true
+  }
+}

test/cluster/versions.tf

@@ -0,0 +1,3 @@
+terraform {
+  required_version = ">= 0.12"
+}