feat(exemples-terraform): Ajout exemple CT Ubuntu Jammy + nginx

exemples-terraform/main.tf

+provider "docker" {
+  host = "unix:///var/run/docker.sock"
+}
+
+resource "docker_image" "ubuntu" {
+  name = "local/ubu-form-cnrs-nginx:latest"
+}
+
+resource "docker_container" "terraform_container" {
+  image = docker_image.ubuntu.latest
+  name  = "nginx_via_terraform"
+  ports {
+    internal = "80"
+    external = "5555"
+  }
+}
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