Thumbnail service, image upload fixes (#119)

thumbnail/docker-image/Dockerfile

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+FROM micro/cells:v3 as builder
+
+#
+# headless chrome
+# taken from https://github.com/Zenika/alpine-chrome/blob/master/Dockerfile
+#
+
+# Installs latest Chromium package.
+RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" > /etc/apk/repositories \
+    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories \
+    && echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories \
+    && echo "http://dl-cdn.alpinelinux.org/alpine/v3.12/main" >> /etc/apk/repositories \
+    && apk upgrade -U -a \
+    && apk add \
+    libstdc++ \
+    chromium \
+    harfbuzz \
+    nss \
+    freetype \
+    ttf-freefont \
+    font-noto-emoji \
+    wqy-zenhei \
+    && rm -rf /var/cache/* \
+    && mkdir /var/cache/apk
+
+COPY local.conf /etc/fonts/local.conf
+
+# Add Chrome as a user
+RUN mkdir -p /usr/src/app \
+    && adduser -D chrome \
+    && chown -R chrome:chrome /usr/src/app
+# Run Chrome as non-privileged
+#USER chrome
+#WORKDIR /usr/src/app
+
+ENV CHROME_BIN=/usr/bin/chromium-browser \
+    CHROME_PATH=/usr/lib/chromium/
+
+RUN apk add libstdc++@edge
+#
+# / headless chrome
+#

thumbnail/docker-image/local.conf

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+<?xml version="1.0"?>
+<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
+<fontconfig>
+
+ <alias>
+   <family>sans-serif</family>
+   <prefer>
+     <family>Main sans-serif font name goes here</family>
+     <family>Noto Color Emoji</family>
+     <family>Noto Emoji</family>
+   </prefer>
+ </alias>
+
+ <alias>
+   <family>serif</family>
+   <prefer>
+     <family>Main serif font name goes here</family>
+     <family>Noto Color Emoji</family>
+     <family>Noto Emoji</family>
+   </prefer>
+ </alias>
+
+ <alias>
+  <family>monospace</family>
+  <prefer>
+    <family>Main monospace font name goes here</family>
+    <family>Noto Color Emoji</family>
+    <family>Noto Emoji</family>
+   </prefer>
+ </alias>
+</fontconfig>