Add Terraform snippets for containerapp/jetty/README.md

acr/jetty/main.tf

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+resource "null_resource" "acr_build" {
+  provisioner "local-exec" {
+    command = <<EOT
+      az acr build --registry ${azurerm_container_registry.joazcr.name} --resource-group ${azurerm_resource_group.joazrg.name} --image ${var.acr_jetty_image} .
+    EOT
+  }
+  depends_on = [azurerm_container_registry.example]
+}
+
+resource "local_file" "acr_jetty_build_output" {
+  content  = file("acr_jetty_build_output.txt")
+  filename = "${path.module}/acr_jetty_build_output.txt"
+}

acr/jetty/outputs.tf

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+output "acr_jetty_image" {
+  description = "The name of the Jetty image"
+  value       = var.acr_jetty_image
+}
+
+output "acr_jetty_build_output" {
+  description = "The output of the ACR build"
+  value       = local_file.acr_jetty_build_output.filename
+}

acr/jetty/variables.tf

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+variable "acr_jetty_image" {
+  description = "The name of the Jetty image"
+  type        = string
+  default     = "jetty:latest"
+}