Update Dockerfile

Dockerfile

@@ -1,9 +1,12 @@
 FROM ubuntu/squid
 
-RUN mkdir -p /run/squid && \
-    chmod -R 777 /run/squid && \
-    chown -R proxy:proxy /run/squid
+# Create user and set permissions
+RUN useradd -m -u 1000 user && \
+    mkdir -p /run/squid && \
+    chown -R user:user /run/squid /etc/squid
 
-# Fix permissions for /etc/squid
-RUN chmod -R 777 /etc/squid
-EXPOSE 3128
+USER user
+
+EXPOSE 3128
+
+CMD ["squid", "-N", "-d", "1"]