Add font ttf-dejavu to oci image

Some plugins may require a font to render graphics, such as the markdown-plantuml plugin.

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Option to create a permanent link to a source file ([#1489](https://github.com/scm-manager/scm-manager/pull/1489))
 - Add markdown codeblock renderer extension point ([#1492](https://github.com/scm-manager/scm-manager/pull/1492))
 - Add Java version to plugin center url ([#1494](https://github.com/scm-manager/scm-manager/pull/1494))
+- Add Font ttf-dejavu to oci image ([#1498](https://github.com/scm-manager/scm-manager/issues/1498))
 
 ## [2.12.0] - 2020-12-17
 ### Added

scm-packaging/docker/Dockerfile

@@ -29,7 +29,7 @@ ENV CACHE_DIR=/var/cache/scm/work
 COPY . /
 
 RUN set -x \
- && apk add --no-cache mercurial bash ca-certificates \
+ && apk add --no-cache ttf-dejavu mercurial bash ca-certificates \
  && addgroup -S -g 1000 scm \
  && adduser -S -s /bin/false -G scm -h ${SCM_HOME} -D -H -u 1000 scm \
  && mkdir -p ${SCM_HOME} ${CACHE_DIR} \