add Dockerfile

Dockerfile

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+# initialize from the image
+
+FROM ubuntu:14.04
+
+# add and update package repositories
+
+RUN echo "deb http://ppa.launchpad.net/terry.guo/gcc-arm-embedded/ubuntu trusty main" >> /etc/apt/sources.list && apt-get update
+
+# install build tools and dependencies
+
+RUN apt-get install -y build-essential git gcc-arm-none-eabi python
+
+# clone the source code
+
+RUN git clone https://github.com/libopencm3/libopencm3 && git clone https://github.com/trezor/trezor-mcu && cd trezor-mcu && git submodule update --init
+
+# build libopencm3
+
+RUN cd libopencm3 && make
+
+# build the firmware
+
+RUN cd trezor-mcu && make && cd firmware && make