feat: Add dev container (#8589)

.devcontainer/devcontainer.json

@@ -0,0 +1,15 @@
+// For format details, see: https://aka.ms/devcontainer.json
+{
+	"name": "Python 3",
+	// Documentation for this image:
+	// - https://github.com/devcontainers/templates/tree/main/src/python
+	// - https://github.com/microsoft/vscode-remote-try-python
+	// - https://hub.docker.com/r/microsoft/devcontainers-python
+	"image": "mcr.microsoft.com/devcontainers/python:1-3.12-bullseye",
+	"features": {
+		"ghcr.io/devcontainers/features/docker-outside-of-docker:1": {},
+		"ghcr.io/devcontainers-extra/features/poetry:2": {},
+		"ghcr.io/devcontainers/features/node:1": {},
+	},
+	"postCreateCommand": ".devcontainer/setup.sh",
+}

.devcontainer/setup.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# Install `nc`
+sudo apt update && sudo apt install netcat -y
+
+# Do common setup tasks
+source .openhands/setup.sh