Modify default port so it cna be used on secured kubernetes

docker/server/Dockerfile

@@ -5,7 +5,7 @@ FROM kiwix/kiwix-tools:$VERSION
 LABEL org.opencontainers.image.source https://github.com/openzim/kiwix-tools
 
 # expose kiwix-serve default port and workdir
-EXPOSE 80
+EXPOSE 8080
 VOLUME /data
 WORKDIR /data
 

docker/server/start.sh

@@ -13,7 +13,11 @@ then
     fi
 fi
 
-CMD="/usr/local/bin/kiwix-serve --port=80 $@"
+if [ -z "$PORT" ]
+then
+    PORT=8080
+fi
+CMD="/usr/local/bin/kiwix-serve --port=$PORT $@"
 echo $CMD
 $CMD