Introduce MAXCONN (default 16384)

Dockerfile

@@ -4,5 +4,5 @@ COPY build.sh /tmp/build.sh
 
 RUN /tmp/build.sh && rm /tmp/build.sh
 
-ENTRYPOINT ["/bin/sh", "-c", "/usr/bin/memcached -vv -m ${MEM:-64} -p ${PORT:-11211} ${ENABLE_SASL:+-S}"]
+ENTRYPOINT ["/bin/sh", "-c", "/usr/bin/memcached -vv -m ${MEM:-64} -c ${MAXCONN:-16384} -p ${PORT:-11211} ${ENABLE_SASL:+-S}"]