feat(external): add external ApplicationSet

For charts that requires external resources

external/.gitignore

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+.terraform*
+terraform.tfstate
+terraform.tfvars

external/applicationset.tf

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+resource "kubernetes_manifest" "external_applicationset" {
+  manifest = {
+    apiVersion = "argoproj.io/v1alpha1"
+    kind = "ApplicationSet"
+    metadata = {
+      name = "external"
+      namespace = "argocd"
+    }
+    spec = {
+      generators = [
+        {
+          git = {
+            directories = [
+              {
+                path = "external/*"
+              }
+            ]
+            repoURL = "https://github.com/khuedoan/homelab.git"
+            revision = "master"
+          }
+        },
+      ]
+      template = {
+        metadata = {
+          name = "{{path.basename}}"
+        }
+        spec = {
+          destination = {
+            name = "in-cluster"
+            namespace = "{{path.basename}}"
+          }
+          project = "default"
+          source = {
+            path = "{{path}}"
+            repoURL = "https://github.com/khuedoan/homelab.git"
+          }
+          syncPolicy = {
+            automated = {
+              prune = true
+              selfHeal = true
+            }
+          }
+        }
+      }
+    }
+  }
+}

external/versions.tf

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+terraform {
+  required_version = "~> 1.0.0"
+
+  backend "remote" {
+    hostname     = "app.terraform.io"
+    organization = "khuedoan"
+
+    workspaces {
+      name = "homelab-external"
+    }
+  }
+
+  required_providers {
+    cloudflare = {
+      source  = "cloudflare/cloudflare"
+      version = "~> 3.4.0"
+    }
+
+    b2 = {
+      source  = "Backblaze/b2"
+      version = "~> 0.7.0"
+    }
+
+    kubernetes = {
+      source = "hashicorp/kubernetes"
+      version = "~> 2.7.0"
+    }
+  }
+}