fix: prevent zombie processes

Author: zhangt2333

Dockerfile

@@ -17,9 +17,10 @@ ENV LANG=C.UTF-8 \
 ARG ENABLE_REPLACE_APT_SOURCES=false
 RUN --mount=type=bind,source=docker/replace-apt-sources.sh,target=replace-apt-sources.sh \
  bash replace-apt-sources.sh ${ENABLE_REPLACE_APT_SOURCES} \
+ && add-apt-repository universe \
  && apt-get update -qq \
  && apt-get install -y -qq --no-install-recommends \
-            ca-certificates tzdata \
+            ca-certificates tzdata tini \
             sudo git unzip wget curl host dos2unix vim \
             make cmake \
             build-essential \
@@ -73,12 +74,14 @@ ENV NACOS_ADDR="127.0.0.1:8848" \
     JAVA_OPT="" \
     JAVA_OPT_EXT=""
 
-ENTRYPOINT /wait                                                   \
+ENTRYPOINT ["/usr/bin/tini", "--"]
+
+CMD /wait                                                          \
  && JAVA_OPT="${JAVA_OPT} -jar sduoj-judger.jar"                   \
  && JAVA_OPT="${JAVA_OPT} ${JAVA_OPT_EXT}"                         \
  && JAVA_OPT="${JAVA_OPT} --sduoj.config.active=$ACTIVE"           \
  && JAVA_OPT="${JAVA_OPT} --sduoj.config.nacos-addr=$NACOS_ADDR"   \
- && echo "SDUOJ is starting, you can check the '/app/logs/judger.log'" \
+ && echo "SDUOJ is starting. Logs are in '/app/logs/judger.log'"   \
  && echo "Run: java ${JAVA_OPT}"                                   \
  && mkdir -p /app/logs                                             \
  && exec java ${JAVA_OPT} >> /app/logs/judger.log 2>&1