fix dockerfile

Dockerfile

@@ -1,11 +1,11 @@
 # syntax=docker/dockerfile:1.4
 ARG BASE_IMAGE=ubuntu
-ARG SYSU_SOURCE_DIR=/opt/SYsU-lang
-ARG SYSU_INSTALL_PREFIX=/opt/sysu
 FROM ${BASE_IMAGE}
 WORKDIR /autograder
-WORKDIR ${SYSU_SOURCE_DIR}
-COPY <<build_install.sh <<run.sh . ${SYSU_SOURCE_DIR}
+ENV SYSU_SOURCE_DIR=/opt/SYsU-lang
+ENV SYSU_INSTALL_PREFIX=/opt/sysu
+WORKDIR \$SYSU_SOURCE_DIR
+COPY <<build_install.sh <<run.sh . \$SYSU_SOURCE_DIR
 #!/bin/sh
 rm -rf $2
 cmake -G Ninja \\
@@ -21,17 +21,17 @@ cmake --build $2/build
 cmake --build $2/build -t install
 build_install.sh
 #!/bin/sh
-python3 -m tarfile -e /autograder/submission/*.tar.gz /opt/submission
-rm -rf ${SYSU_SOURCE_DIR}/generator
-cp -r /opt/submission/*-Source/generator ${SYSU_SOURCE_DIR}
-rm -rf ${SYSU_SOURCE_DIR}/optimizer
-cp -r /opt/submission/*-Source/optimizer ${SYSU_SOURCE_DIR}
-rm -rf /opt/submission
-\${SYSU_SOURCE_DIR}/build_install.sh
+python3 -m tarfile -e /autograder/submission/*.tar.gz \$SYSU_SOURCE_DIR/submission
+rm -rf \$SYSU_SOURCE_DIR/generator
+cp -r \$SYSU_SOURCE_DIR/submission/*-Source/generator \$SYSU_SOURCE_DIR
+rm -rf \$SYSU_SOURCE_DIR/optimizer
+cp -r \$SYSU_SOURCE_DIR/submission/*-Source/optimizer \$SYSU_SOURCE_DIR
+rm -rf \$SYSU_SOURCE_DIR/submission
+\$SYSU_SOURCE_DIR/build_install.sh
 mkdir -p /autograder/results
 sysu-compiler \\
     --unittest=benchmark_generator_and_optimizer_1 \\
-    "${SYSU_SOURCE_DIR}/**/*.sysu.c" >/autograder/results/results.json
+    "\$SYSU_SOURCE_DIR/**/*.sysu.c" >/autograder/results/results.json
 run.sh
 RUN <<EOF
 apt-get update -y
@@ -42,11 +42,11 @@ apt-get install -y --no-install-recommends \
 apt-get autoremove -y
 apt-get clean -y
 rm -rf /var/lib/apt/lists/*
-cat \${SYSU_SOURCE_DIR}/run.sh
-mv \${SYSU_SOURCE_DIR}/run.sh /autograder/run
+cat \$SYSU_SOURCE_DIR/run.sh
+mv \$SYSU_SOURCE_DIR/run.sh /autograder/run
 chmod +x /autograder/run
-chmod +x \${SYSU_SOURCE_DIR}/build_install.sh
-\${SYSU_SOURCE_DIR}/build_install.sh \${SYSU_SOURCE_DIR} \${SYSU_INSTALL_PREFIX}
+chmod +x \$SYSU_SOURCE_DIR/build_install.sh
+\$SYSU_SOURCE_DIR/build_install.sh \$SYSU_SOURCE_DIR \$SYSU_INSTALL_PREFIX
 EOF
 ENV PATH=${SYSU_INSTALL_PREFIX}/bin:$PATH \
     CPATH=${SYSU_INSTALL_PREFIX}/include:$CPATH \