Create Dev Container configuration

.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/devcontainers/templates/tree/main/src/docker-existing-dockerfile
+{
+	"name": "Existing Dockerfile",
+	"build": {
+		// Sets the run context to one level up instead of the .devcontainer folder.
+		"context": "..",
+		"dockerfile": "../Dockerfile"
+	},
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	"features": {
+		"ghcr.io/devcontainers/features/common-utils:2": {}
+	},
+
+	// 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": "echo hello",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Connect as an existing user other than the container default. More info: https://aka.ms/dev-containers-non-root.
+	"remoteUser": "devcontainer"
+}