Add devcontainer (#4491)

devcontainers can be used by IDEs/editors like VS Code to create a standardized development environment in a container

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/cpp:1-debian-12
+
+# [Optional] Uncomment this section to install additional packages.
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends \
+    ca-certificates \
+    g++ \
+    git \
+    libbluetooth-dev \
+    libgpiod-dev \
+    liborcania-dev \
+    libssl-dev \
+    libulfius-dev \
+    libyaml-cpp-dev \
+    pkg-config \
+    python3 \
+    python3-pip \
+    python3-venv \
+    python3-wheel \
+    wget \
+    zip \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+RUN pip3 install --no-cache-dir -U platformio==6.1.15

.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/cpp
+{
+  "name": "Meshtastic Firmware Dev",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "features": {
+    "ghcr.io/devcontainers/features/python:1": {
+      "installTools": true,
+      "version": "latest"
+    }
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-vscode.cpptools",
+        "platformio.platformio-ide",
+      ]
+    }
+  },
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  "forwardPorts": [ 4403 ],
+
+  // Run commands to prepare the container for use
+  "postCreateCommand": ".devcontainer/setup.sh",
+}

.devcontainer/setup.sh

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+#!/usr/bin/env sh
+
+git submodule update --init