switch to ubuntu18.04 base image, php7.2 and clean up build

.drone.yml

@@ -1,20 +1,16 @@
 pipeline:
 
-  build:
-    image: alpine:edge
-    commands:
-      - sed -i 's@<TAG>@${BUILD_VERSION}@' Dockerfile
-
   docker:
     image: plugins/docker
     repo: bunix42/ttrss
+    build_args:
+      - TTRSS_GIT_TAG=${TTRSS_GIT_TAG}
     tags:
-     - ${BUILD_VERSION}
+     - ${TTRSS_GIT_TAG}
     secrets: [ docker_username, docker_password ]
 
 matrix:
-  BUILD_VERSION:
+  TTRSS_GIT_TAG:
     - master
-    - 17.4
-    - 17.12
     - 18.12
+    - 19.2

Dockerfile

@@ -1,12 +1,23 @@
-FROM ubuntu:14.04
+FROM ubuntu:18.04
 MAINTAINER Hanjo Meinhardt <hanjo@bunix.de>
 
-RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y \
-  nginx supervisor php5-fpm php5-cli php5-curl php5-gd php5-json \
-  php5-pgsql php5-mysql php5-mcrypt && apt-get clean && rm -rf /var/lib/apt/lists/*
+ARG TTRSS_GIT_TAG=master
+
+RUN apt-get update && apt-get install -y \
+  nginx \
+  supervisor \
+  php7.2-fpm \
+  php7.2-cli \
+  php7.2-curl \
+  php7.2-gd \
+  php7.2-json \
+  php7.2-pgsql \
+  php7.2-mysql \
+  curl \
+  && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 # enable the mcrypt module
-RUN php5enmod mcrypt
+#RUN php7enmod mcrypt
 
 # add ttrss as the only nginx site
 ADD ttrss.nginx.conf /etc/nginx/sites-available/ttrss
@@ -15,11 +26,13 @@ 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/* \
-    && curl -SL https://git.tt-rss.org/git/tt-rss/archive/<TAG>.tar.gz | tar xzC /var/www --strip-components 1 \
-    && apt-get purge -y --auto-remove curl \
-    && chown www-data:www-data -R /var/www
-RUN cp config.php-dist config.php
+
+#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 \
+
+RUN curl -SL https://git.tt-rss.org/git/tt-rss/archive/$TTRSS_GIT_TAG.tar.gz | tar xzC /var/www --strip-components 1 \
+    && chown www-data:www-data -R /var/www \
+    && cp config.php-dist config.php
 
 # expose only nginx HTTP port
 EXPOSE 80