feat: update name of the dev container

Signed-off-by: ebolo <daothanhduy305@gmail.com>

.devcontainer/devcontainer.json

@@ -1,7 +1,7 @@
 // For format details, see https://aka.ms/devcontainer.json. For config options, see the
 // README at: https://github.com/devcontainers/templates/tree/main/src/dotnet
 {
-  "name": "C# (.NET)",
+  "name": "caddy-manager-devcon",
   // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
   "image": "mcr.microsoft.com/devcontainers/dotnet:1-9.0",
   // Features to add to the dev container. More info: https://containers.dev/features.