Add docker file varnish

varnish/Dockerfile

+FROM debian:latest
+MAINTAINER ZeroC0D3 Team<zeroc0d3.team@gmail.com>
+
+# Set Environment Variables
+ENV DEBIAN_FRONTEND noninteractive
+
+# Install Dependencies
+RUN apt-get update && apt-get install -y apt-utils && apt-get upgrade -y
+RUN mkdir /home/site && mkdir /home/site/cache
+RUN apt-get install -y varnish
+RUN rm -rf /var/lib/apt/lists/*
+
+# Setting Configurations
+ENV VARNISH_CONFIG  /etc/varnish/default.vcl
+ENV CACHE_SIZE      128m
+ENV VARNISHD_PARAMS -p default_ttl=3600 -p default_grace=3600
+ENV VARNISH_PORT    6081
+ENV BACKEND_HOST    localhost
+ENV BACKEND_PORT    80
+
+ADD default.vcl /etc/varnish/default.vcl
+ADD start.sh /etc/varnish/start.sh
+
+RUN chmod +x /etc/varnish/start.sh
+
+CMD ["/etc/varnish/start.sh"]

varnish/start.sh

+#!/usr/bin/env bash
+set -e
+
+for name in BACKEND_PORT BACKEND_HOST VARNISH_SERVER
+do
+    eval value=\$$name
+    sed -i "s|\${${name}}|${value}|g" /etc/varnish/default.vcl
+done
+
+exec bash -c \
+    "exec varnishd \
+    -a :$VARNISH_PORT \
+    -T localhost:6082 \
+    -F -u varnish \
+    -f $VARNISH_CONFIG \
+    -s malloc,$CACHE_SIZE \
+    $VARNISHD_PARAMS"
\ No newline at end of file