Add devcontainer

.devcontainer/Dockerfile

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+# 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 apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends direnv
+
+

.devcontainer/devcontainer.json

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+// 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": "acme-fitness-store",
+	"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"
+		}
+	},
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+	"onCreateCommand": "./.devcontainer/scripts/onCreateCommand.sh",
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// Comment out to connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode",
+	"hostRequirements": {
+		"cpus": 2
+	},
+	"containerEnv": {
+		"GRADLE_USER_HOME": "/home/vscode", // required because the java feature is not setting this correctly
+		"M2": "/home/vscode" // required because the java feature is not setting this correctly
+	},
+	"features": {
+		"azure-cli": "latest",
+		"docker-from-docker": "latest",
+		"node": "lts",
+		"ghcr.io/devcontainers/features/java:1": {
+			"version": "17",
+			"installGradle": true,
+			"installMaven": true
+		}
+	}
+}

.devcontainer/scripts/onCreateCommand.sh

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+#!/bin/bash
+
+set -x
+
+az extension add --name spring
+