Add dev container

.devcontainer/Dockerfile

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+FROM ubuntu:24.04 AS builder
+
+# Pilot build against the xrdp/xorgxrdp "devel" branches (pre-0.11).
+# This is NOT the same codebase as Dockerfile (v0.10.x) - devel is ~787
+# commits / ~300 files ahead of v0.10.6.1, and xorgxrdp's devel branch has
+# moved together with it (137 commits / 81 files ahead of v0.10.5). Track
+# them as a pair; don't mix a devel xrdp with a tagged xorgxrdp or vice versa.
+#
+# Known deltas from the v0.10.x build baked into this file:
+#   - New hard dep: libxkbfile-dev (unconditional XKB header check)
+#   - --enable-ibus now also needs libibus-1.0-dev + libglib2.0-dev
+#   - NVENC support moved into a new helper binary (xrdp-accel-assist) that
+#     vendors its own NVENC API headers, so the nv-codec-headers clone/symlink
+#     step from the stable Dockerfile is gone - it's dead weight on devel.
+#   - --enable-accel is auto-derived from --enable-nvenc in configure.ac, so
+#     no new configure flag is needed to get xrdp-accel-assist built.
+#
+# devel is a floating branch, not a tag: Docker layer caching means a
+# `docker build` with no cache change will keep reusing an old clone.
+# Always pass --no-cache (or otherwise bust the git-clone layers) to actually
+# pick up new commits on each pilot run.
+#
+# Usage:
+#   docker build --no-cache -f Dockerfile.devel -t xrdp-builder:devel .
+#   docker run --rm -v $(pwd)/packages:/output xrdp-builder:devel
+
+# Get build and target platform info
+ARG TARGETPLATFORM
+ARG BUILDPLATFORM
+ARG TARGETARCH
+ARG TARGETVARIANT
+
+# Build arguments for versions - devel branches by default for this pilot
+ARG XRDP_VERSION=devel
+ARG XORGXRDP_VERSION=devel
+ARG PW_MODULE_XRDP_VERSION=devel
+
+# Prevent interactive prompts during build
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y \
+    git \
+    autoconf \
+    automake \
+    libtool \
+    pkg-config \
+    gcc \
+    g++ \
+    make \
+    libssl-dev \
+    libpam0g-dev \
+    libx11-dev \
+    libxfixes-dev \
+    libxrandr-dev \
+    libxkbfile-dev \
+    nasm \
+    xsltproc \
+    flex \
+    bison \
+    libxml2-dev \
+    dpkg-dev \
+    libcap-dev \
+    libfuse3-dev \
+    libpixman-1-dev \
+    intltool \
+    xserver-xorg-dev \
+    xserver-xorg-core \
+    libconfig-dev \
+    libjpeg-dev \
+    wget \
+    libturbojpeg-dev \
+    libx264-dev \
+    libpulse-dev \
+    libopus-dev \
+    libibus-1.0-dev \
+    libglib2.0-dev \
+    ca-certificates \
+    libepoxy-dev \
+    libasound2-dev \
+    libdrm-dev \
+    libglvnd-dev \
+    libgbm-dev \
+    pipewire \
+    libpipewire-0.3-dev \
+    libspa-0.2-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN apt-get update && apt-get install -y \
+    nano \
+    xvfb \
+    xdotool \
+    ibus \
+    dbus-x11 \
+    openbox \
+    && rm -rf /var/lib/apt/lists/*
+
+# Match the workspaceFolder set in devcontainer.json
+WORKDIR /workspace
+CMD [ "tail", "-f", "/dev/null" ]

.devcontainer/devcontainer.json

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+{
+  "$schema": "https://raw.githubusercontent.com/devcontainers/spec/main/schemas/devContainer.schema.json",
+  "name": "XRDP",
+  "build": { "dockerfile": "Dockerfile" },
+  "workspaceFolder": "/workspace",
+  "workspaceMount": "source=${localWorkspaceFolder},target=/workspace,type=bind",
+  "remoteUser": "root",
+  "mounts": [
+  {
+    "source": "${localEnv:HOME}${localEnv:USERPROFILE}/.claude",
+    "target": "/root/.claude",
+    "type": "bind",
+    "consistency": "cached"
+  },
+  {
+    "source": "${localEnv:HOME}${localEnv:USERPROFILE}/.gitconfig",
+    "target": "/root/.gitconfig",
+    "type": "bind",
+    "consistency": "cached"
+  },
+  {
+    "source": "${localEnv:HOME}${localEnv:USERPROFILE}/.git-credentials",
+    "target": "/root/.git-credentials",
+    "type": "bind",
+    "consistency": "cached"
+  }
+
+]
+}