split out the builder container and add feedly theme

Dockerfile

@@ -1,9 +1,25 @@
-FROM ubuntu:18.04
-MAINTAINER Hanjo Meinhardt <hanjo@bunix.de>
+FROM ubuntu:18.04 AS builder
 
 ARG TTRSS_GIT_TAG=master
+ARG FEEDLY_GIT_TAG=master
+
+# install curl to fetch stuff
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+  curl
+
+# download tagged version of tt-rss sources
+RUN mkdir -p /download/ttrss \
+  && curl -SL https://git.tt-rss.org/git/tt-rss/archive/$TTRSS_GIT_TAG.tar.gz | tar xzC /download/ttrss --strip-components 1
+
+# download some themes
+RUN mkdir -p /download/feedly-theme \
+  && curl -SL https://github.com/levito/tt-rss-feedly-theme/archive/v$FEEDLY_GIT_TAG.tar.gz | tar xzC /download/feedly-theme --strip-components 1
 
-RUN apt-get update && apt-get install -y \
+
+FROM ubuntu:18.04
+MAINTAINER Hanjo Meinhardt <hanjo@bunix.de>
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   nginx \
   supervisor \
   php7.2-fpm \
@@ -16,12 +32,8 @@ RUN apt-get update && apt-get install -y \
   php7.2-intl \
   php7.2-mbstring \
   php7.2-xml \
-  curl \
   && apt-get clean && rm -rf /var/lib/apt/lists/*
 
-# enable the mcrypt module
-#RUN php7enmod mcrypt
-
 # add ttrss as the only nginx site
 ADD ttrss.nginx.conf /etc/nginx/sites-available/ttrss
 RUN ln -s /etc/nginx/sites-available/ttrss /etc/nginx/sites-enabled/ttrss
@@ -30,14 +42,17 @@ RUN rm /etc/nginx/sites-enabled/default
 # install ttrss and patch configuration
 WORKDIR /var/www
 
-#RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y curl --no-install-recommends && rm -rf /var/lib/apt/lists/* \
-#    && apt-get purge -y --auto-remove curl \
+# copy the ttrss sources
+COPY --from=builder /download/ttrss ./
 
-RUN curl -SL https://git.tt-rss.org/git/tt-rss/archive/$TTRSS_GIT_TAG.tar.gz | tar xzC /var/www --strip-components 1
+# copy the feedly theme files
+COPY --from=builder /download/feedly-theme/feedly ./themes.local/feedly/
+COPY --from=builder /download/feedly-theme/feedly*.css ./themes.local/
 
+# prepare the runtime environment
 RUN cp config.php-dist config.php \
     && chown www-data:www-data -R /var/www \
-    && mkdir /var/run/php
+    && mkdir -p /var/run/php
 
 # expose only nginx HTTP port
 EXPOSE 80