added devcontainer

.devcontainer/Dockerfile

@@ -0,0 +1,36 @@
+FROM debian:trixie
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    clang \
+    flex \
+    bison \
+    g++ \
+    gawk \
+    gettext \
+    git \
+    libncurses-dev \
+    libssl-dev \
+    python3 \
+    rsync \
+    unzip \
+    zlib1g-dev \
+    file \
+    wget \
+    patch \
+    time \
+    sudo \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
+
+RUN adduser openwrt --disabled-password --gecos "" && \
+    echo "openwrt ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
+
+USER openwrt
+WORKDIR /home/openwrt
+
+RUN git clone https://github.com/openwrt/openwrt.git && \
+    mkdir -p /home/openwrt/openwrt/package/OpenUniFi
+
+WORKDIR /home/openwrt/openwrt/package/OpenUniFi