dev container: proof of custom docker file

.devcontainer/Dockerfile

@@ -0,0 +1,3 @@
+FROM mcr.microsoft.com/devcontainers/base:jammy
+
+# Optional: install additional tools here

.devcontainer/devcontainer.json

@@ -1,9 +1,11 @@
 // For format details, see https://aka.ms/devcontainer.json. For config options, see the
 // README at: https://github.com/devcontainers/templates/tree/main/src/ubuntu
 {
-	"name": "git-limbosolutions-com-dev-container",
+	"name": "git-limbosolutions-com-dev",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/base:jammy",
+	"build": {
+		"dockerfile": "Dockerfile"
+	},
 	"features": {
 		"ghcr.io/devcontainers/features/kubectl-helm-minikube:1": {}
 	},