Fix NPE at java FontConfiguration when running in docker container.

Base image Alpine-JRE8 doesn't install as dependency fontconfig and
some font. Added them to buildsteps.

Signed-off-by: Yahor Berdnikau <egorr.berd@gmail.com>

install/docker/Dockerfile

@@ -12,6 +12,8 @@ RUN apk --no-cache add \
     lame \
     bash \
     libressl \
+    fontconfig \
+    ttf-dejavu \
     ca-certificates \
     tini \
     openjdk8-jre