Create Dockerfile to build custom firmware

Dockerfile

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+FROM i386/ubuntu:12.04
+
+RUN sed -i 's/archive.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list && \
+    sed -i 's/security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
+
+RUN apt-get update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y \
+        build-essential \
+        flex \
+        bison \
+        make \
+        autoconf \
+        zlib1g-dev \
+        git \
+        subversion \
+        gettext \
+        gcc \
+        binutils \
+        bzip2 \
+        python \
+        perl \
+        findutils \
+        grep \
+        diffutils \
+        unzip \
+        gawk \
+        util-linux \
+        libz-dev \
+        libc6-dev \
+        libncurses-dev \
+        libncurses5-dev \
+        file \
+        rsync \
+        wget \
+        && apt-get clean
+
+COPY vmg8825_b50b_release /home/builder/openwrt
+RUN useradd -m -s /bin/bash builder
+RUN chown -R builder:builder /home/builder/openwrt
+USER builder
+WORKDIR /home/builder
+
+CMD ["/bin/bash"]