Add dfu converter (#336)

* Install hex2dfu in Dockerfile
* Add convert and upload dfu files for bootloader and firmware

docker/Dockerfile

@@ -66,6 +66,13 @@ RUN apt update && \
         dfu-util \
     && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
+# install hex2dfu
+
+RUN wget https://github.com/rusdacent/hex2dfu/archive/master.zip --output-document=hex2dfu.zip && \
+    unzip hex2dfu.zip && \
+    cd hex2dfu-master && gcc hex2dfu.c ED25519/*.c -o hex2dfu && \
+    ln -s ${PWD}/hex2dfu /usr/bin/hex2dfu
+
 COPY entrypoint.sh syntax_check.sh /
 
 RUN chmod +x /syntax_check.sh