fixed the vul

Author: divyagovindaiah

build/content-service/Dockerfile

@@ -1,9 +1,12 @@
 FROM --platform=linux/x86_64 eclipse-temurin:11.0.20.1_1-jdk-focal
 RUN apt-get update \
+    && apt-get upgrade -y \
     && apt-get install -y unzip curl \
     && adduser --uid 1001 --home /home/sunbird/ --disabled-login sunbird \
     && mkdir -p /home/sunbird \
-    && chown -R sunbird:sunbird /home/sunbird
+    && chown -R sunbird:sunbird /home/sunbird \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 USER sunbird
 COPY ./content-api/content-service/target/content-service-1.0-SNAPSHOT-dist.zip /home/sunbird/
 RUN unzip /home/sunbird/content-service-1.0-SNAPSHOT-dist.zip -d /home/sunbird/