add missing font

https://github.com/fphammerle/docker-brave-browser/issues/1#issuecomment-818993981

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- added missing font
 
 ## [0.2.0] - 2021-02-16
 ### Added

Dockerfile

@@ -12,6 +12,7 @@ FROM docker.io/debian:10.9-slim
 RUN apt-get update \
     && apt-get install --yes --no-install-recommends \
         ca-certificates \
+        fonts-tlwg-waree-ttf \
         gnupg \
         libgl1 \
     && apt-key adv --keyserver pool.sks-keyservers.net \