Added fonts to container

It need to some application as Chord Generatora

Dockerfile

@@ -1,6 +1,9 @@
 FROM sapmachine:lts-jre-alpine
 MAINTAINER -=:dAs:=-
 
+RUN apk add --no-cache fontconfig ttf-dejavu
+RUN apk add --no-cache fontconfig ttf-dejavu \
+    && fc-cache -f
 RUN apk add --no-cache --upgrade bash
 RUN mkdir /app
 # If applications need to be accomadated in the container directly - uncomment next 3 rows