[Docker] Minor fixes in Dockerfiles

doc/docker/Dockerfile-nginx

@@ -16,7 +16,7 @@ RUN composer run-script post-install-cmd --no-interaction
 
 # Copy over just the files we want in second stage, so resulting stage only has assets
 # and vhost config in as few layers as possible
-FROM nginx:stable-alpine as web-multilayers
+FROM nginx:stable as web-multilayers
 
 COPY bin/vhost.sh /var/www/bin/vhost.sh
 COPY doc/nginx/vhost.template /var/www/doc/nginx/vhost.template

doc/docker/Dockerfile-varnish

@@ -4,9 +4,10 @@ ENV DEBIAN_FRONTEND noninteractive
 
 # Use packages from Varnish to get Varnsih 5.1, 5.0 packages with debian:stretch gives segmentation faults
 RUN apt-get update -q -y && \
-    apt-get install -q -y --force-yes --no-install-recommends ca-certificates curl && \
+    apt-get install -q -y --no-install-recommends ca-certificates curl && \
     curl -s https://packagecloud.io/install/repositories/varnishcache/varnish5/script.deb.sh | bash && \
-    apt-get install -q -y --force-yes --no-install-recommends varnish
+    apt-get install -q -y --allow-unauthenticated --no-install-recommends varnish && \
+    rm -rf /var/lib/apt/lists/*
 
 COPY doc/varnish/vcl/varnish4.vcl /etc/varnish/default.vcl
 COPY doc/docker/entrypoint/varnish/parameters.vcl /etc/varnish/parameters.vcl

doc/docker/varnish.yml

@@ -21,6 +21,10 @@ services:
      - "8081:80"
     depends_on:
      - web
+     - app
+    networks:
+     - frontend
+     - backend
 
 
 ## DEBUG??