update code

laradock/varnish/Dockerfile

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+FROM varnish:6.3
+
+# Set Environment Variables
+ENV DEBIAN_FRONTEND noninteractive
+
+# 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
+
+COPY default.vcl /etc/varnish/default.vcl
+COPY start.sh /etc/varnish/start.sh
+
+RUN chmod +x /etc/varnish/start.sh
+
+CMD ["/etc/varnish/start.sh"]
+
+EXPOSE 8080