Initial devcontainer scaffolding (#66)

* adds devcontainer setup, docker-compose based

* add python via a feature

Author: kostapetan

.devcontainer/Dockerfile

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+# Note: You can use any Debian/Ubuntu based image you want. 
+FROM mcr.microsoft.com/devcontainers/base:bullseye
+
+# [Optional] Uncomment this section to install additional OS packages.
+# RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+#     && apt-get -y install --no-install-recommends <your-package-list-here>

.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-outside-of-docker-compose
+{
+	"name": "agnext devcontainer",
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "devcontainer",
+	"workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
+
+	// Use this environment variable if you need to bind mount your local source code into a new container.
+	"remoteEnv": {
+		"LOCAL_WORKSPACE_FOLDER": "${localWorkspaceFolder}"
+	},
+
+	"features": {
+		"ghcr.io/devcontainers/features/docker-outside-of-docker:1": {
+			"moby": true,
+			"installDockerBuildx": true,
+			"version": "latest",
+			"dockerDashComposeVersion": "none"
+		},
+		"ghcr.io/devcontainers/features/python:1": {
+			"installTools": true,
+			"version": "latest"
+		}
+	},
+	// 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": "bash .devcontainer/startup.sh",
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	"remoteUser": "root",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-python.python",
+				"ms-python.debugpy"
+			]
+		}
+	}
+}

.devcontainer/docker-compose.yml

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+version: '3'
+
+services:
+  devcontainer:
+    build: 
+      context: .
+      dockerfile: Dockerfile
+
+    volumes:
+      # Forwards the local Docker socket to the container.
+      - /var/run/docker.sock:/var/run/docker-host.sock 
+      # Update this to wherever you want VS Code to mount the folder of your project
+      - ../..:/workspaces:cached
+
+    # Overrides default command so things don't shut down after the process ends.
+    entrypoint: /usr/local/share/docker-init.sh
+    command: sleep infinity 
+
+    # Uncomment the next four lines if you will use a ptrace-based debuggers like C++, Go, and Rust.
+    # cap_add:
+    #  - SYS_PTRACE
+    # security_opt:
+    #   - seccomp:unconfined
+
+    # Use "forwardPorts" in **devcontainer.json** to forward an app port locally. 
+    # (Adding the "ports" property to this file will not forward from a Codespace.)

.devcontainer/startup.sh

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+#!/bin/bash