Refactoring Dockerfile (#440)

* rm rust toolchain from Dockerfile
* rm st-flash from Dockerfile
* rm cargo PATH from Dockerfile

docker/Dockerfile

@@ -1,7 +1,5 @@
 FROM ubuntu:18.04
 
-ENV PATH /root/.cargo/bin:$PATH
-
 RUN apt update && \
     DEBIAN_FRONTEND=noninteractive apt install -y --no-install-recommends \
         software-properties-common \
@@ -38,16 +36,6 @@ RUN apt update && \
         clang-format-12 \
         && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --profile=minimal --target thumbv7em-none-eabi thumbv7em-none-eabihf && \
-    rustup component add rustfmt --toolchain stable-x86_64-unknown-linux-gnu
-
-# st-flash
-
-RUN wget https://github.com/stlink-org/stlink/archive/v1.5.1.zip && \
-    unzip v1.5.1.zip && \
-    cd stlink-1.5.1 && make clean && make release && \
-    cd build/Release && make install && ldconfig
-
 # install arm-none-eabi
 
 RUN wget https://developer.arm.com/-/media/Files/downloads/gnu-rm/10-2020q4/gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2 && \
@@ -66,7 +54,7 @@ RUN wget https://github.com/rusdacent/hex2dfu/archive/master.zip --output-docume
 # install openocd
 
 RUN git clone --depth 1 --branch v0.11.0 https://github.com/ntfreak/openocd.git && \
-    cd openocd && ./bootstrap && ./configure && ls -la && make install && \
+    cd openocd && ./bootstrap && ./configure && make install && \
     openocd --version
 
 COPY entrypoint.sh syntax_check.sh /