DockerfileにRustのツールチェインを追加

Dockerfile

@@ -4,13 +4,17 @@ COPY . /nykk
 WORKDIR /nykk
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
-		xz-utils \
 		build-essential \
+		ca-certificates \
 		curl \
+		xz-utils \
 	&& rm -rf /var/lib/apt/lists/* \
 	&& curl -SL http://releases.llvm.org/7.0.0/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz | tar -xJC / \
 	&& mv /clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04 /clang_7.0.0 \
-	&& echo 'export PATH=/clang_7.0.0/bin:$PATH' >> ~/.bashrc \
-	&& echo 'export LD_LIBRARY_PATH=/clang_7.0.0/lib:LD_LIBRARY_PATH' >> ~/.bashrc
+	&& curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain stable
+
+ENV PATH=/clang_7.0.0/bin:$PATH
+ENV PATH=/root/.cargo/bin:$PATH
+ENV LD_LIBRARY_PATH=/clang_7.0.0/lib:$LD_LIBRARY_PATH
 
 CMD [ "/bin/bash" ]