rm dev container docker file

.devcontainer/Dockerfile

@@ -1,14 +0,0 @@
-# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.245.2/containers/ubuntu/.devcontainer/base.Dockerfile
-
-# [Choice] Ubuntu version (use ubuntu-22.04 or ubuntu-18.04 on local arm64/Apple Silicon): ubuntu-22.04, ubuntu-20.04, ubuntu-18.04
-ARG VARIANT="jammy"
-FROM mcr.microsoft.com/vscode/devcontainers/base:0-${VARIANT}
-
-RUN mkdir /nix \
-    && chown vscode /nix \
-    && su vscode -c "sh <(curl -L https://nixos.org/nix/install) --no-daemon"
-
-RUN su vscode -c "/home/vscode/.nix-profile/bin/nix-env -i nixpkgs-fmt"
-
-RUN echo 'nix --experimental-features "nix-command flakes" develop' > /usr/bin/devShell \
-   && chmod +x /usr/bin/devShell 

.devcontainer/dev_shell/devcontainer-feature.json

@@ -0,0 +1,9 @@
+{
+    "name": "DevShell",
+    "id": "dev_shell",
+    "version": "1.0.0",
+    "description": "A nix based dev shell",
+    "installsAfter": [
+        "ghcr.io/devcontainers/features/nix:1"
+    ]
+}

.devcontainer/dev_shell/install.sh

@@ -0,0 +1,6 @@
+#!/bin/env sh
+
+nix-env -i nixpkgs-fmt
+
+echo 'nix --experimental-features "nix-command flakes" develop' > /usr/bin/devShell
+chmod +x /usr/bin/devShell 

.devcontainer/devcontainer.json

@@ -1,29 +1,32 @@
-// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
-// https://github.com/microsoft/vscode-dev-containers/tree/v0.245.2/containers/ubuntu
 {
 	"name": "Ubuntu",
-	"build": {
-		"dockerfile": "Dockerfile",
-		// Update 'VARIANT' to pick an Ubuntu version: jammy / ubuntu-22.04, focal / ubuntu-20.04, bionic /ubuntu-18.04
-		// Use ubuntu-22.04 or ubuntu-18.04 on local arm64/Apple Silicon.
-		"args": { "VARIANT": "ubuntu-22.04" }
+	"image": "mcr.microsoft.com/devcontainers/base:jammy",
+	"features": {
+		"ghcr.io/devcontainers/features/docker-from-docker:1": {},
+		"ghcr.io/devcontainers/features/nix:1": {},
+		"./dev_shell": {}
 	},
-	"extensions": [
-		"donjayamanne.githistory",
-		"jnoortheen.nix-ide",
-		"ms-azuretools.vscode-docker",
-		"eamodio.gitlens",
-		"streetsidesoftware.code-spell-checker"
-	],
+	// Features to add to the dev container. More info: https://containers.dev/implementors/features.
+	// "features": {},
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [],
-
 	// Use 'postCreateCommand' to run commands after the container is created.
-	// "postCreateCommand": "uname -a",
-
-	// Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
-	"remoteUser": "vscode",
-	"features": {
-		"docker-from-docker": "latest"
+	//"onCreateCommand":"nix-env -i nixpkgs-fmt",
+	// Configure tool-specific properties.
+	"customizations": {
+		// Configure properties specific to VS Code.
+		"vscode": {
+			// Set *default* container specific settings.json values on container create.
+			"settings": {},
+			"extensions": [
+				"donjayamanne.githistory",
+				"jnoortheen.nix-ide",
+				"ms-azuretools.vscode-docker",
+				"eamodio.gitlens",
+				"streetsidesoftware.code-spell-checker"
+			]
+		}
 	}
-}
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}