feat: add varnish default vcl

proxy_cached/Dockerfile

@@ -23,6 +23,7 @@ RUN apt-get -y update && apt-get -y upgrade &&\
 
 COPY docker-entrypoint.sh /
 COPY nginx.default.template /
+COPY varnish.default.template /
 
 RUN set -e; \
     export DEBIAN_FRONTEND=noninteractive; \

proxy_cached/docker-entrypoint.sh

@@ -2,6 +2,7 @@
 
 set -e
 
+cp /varnish.default.template /etc/varnish/default.vcl
 envsubst '$SERVER_NAME$PROXY_PROTO$PROXY_HOST' < /nginx.default.template > /etc/nginx/default.conf;
 
 if [ "$#" -eq 0 ] ; then

proxy_cached/varnish.default.template

@@ -0,0 +1,14 @@
+vcl 4.1;
+
+backend default {
+   .host = "127.0.0.1";
+   .port = "8080";
+}
+
+sub vcl_recv {
+   if (req.method != "GET" && req.method != "HEAD") {
+      return (pass);
+   }
+
+   return (hash);
+}