feat(argo-cd): add terraform

terraform/github.tf

@@ -41,3 +41,9 @@ resource "github_actions_secret" "private_repos_aws_secret_key" {
   secret_name     = "GH_AWS_SECRET_ACCESS_KEY"
   plaintext_value = aws_iam_access_key.gh-actions.secret
 }
+
+// Ensure a kube-manifests repository exists for Argo deployments
+resource "github_repository" "kube_manifests_repository" {
+  name        = "kube-manifests"
+  description = "Kubernetes manifests for our cluster"
+}

terraform/helm/argo-cd.yaml

@@ -0,0 +1,20 @@
+server:
+  additionalApplications:
+  - name: labs-kube-manifests
+    namespace: argo-cd
+    project: default
+    source:
+      repoURL: https://github.com/pennlabs/kube-manifests.git
+      targetRevision: HEAD
+      path: .
+      directory:
+        recurse: true
+    destination:
+      server: https://kubernetes.default.svc
+      namespace: default
+    syncPolicy:
+      syncOptions:
+      - CreateNamespace=true
+      automated:
+        prune: true
+        selfHeal: true

terraform/modules/base_cluster/argo-cd.tf

@@ -0,0 +1,14 @@
+resource "kubernetes_namespace" "argo-cd" {
+  metadata {
+    name = "argo-cd"
+  }
+}
+
+resource "helm_release" "argo-cd" {
+  name       = "argo-cd"
+  repository = "https://argoproj.github.io/argo-helm"
+  chart      = "argo-cd"
+  version    = "4.3.0"
+  namespace  = kubernetes_namespace.argo-cd.metadata[0].name
+  values     = var.argo-cd_values
+}

terraform/modules/base_cluster/variables.tf

@@ -27,3 +27,9 @@ variable "datadog_values" {
   description = "Values to provide to the Datadog helm chart"
   type        = list(string)
 }
+
+// Argo-cd values
+variable "argo-cd_values" {
+  description = "Values to provide to the Argo-cd helm chart"
+  type        = list(string)
+}

terraform/production-cluster.tf

@@ -40,6 +40,7 @@ module "production-cluster" {
     roleARN = module.iam-cert-manager.role-arn
   })]
   datadog_values = [file("helm/datadog.yaml")]
+  argo-cd_values = [file("helm/argo-cd.yaml")]
 }