[etherpad-web/oscp-backend] Install libreoffice-core

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 65d749a705443d2bd5a109c59b7642f470c16805
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Wed May 20 10:47:04 2020 +0200

    Install libreoffice-core

 Dockerfile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/Dockerfile b/Dockerfile
index e418a27..93c8499 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,9 +3,9 @@ FROM node:10-buster-slim
 ENV ETHERPAD_VERSION 1.8.4
 ENV NODE_ENV production
 
-RUN apt-get update && \
+RUN apt-get update --no-install-recommends && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y \
-    ca-certificates curl unzip mariadb-client libreoffice-common --no-install-recommends && \
+    ca-certificates curl unzip mariadb-client libreoffice-core libreoffice-common && \
     rm -r /var/lib/apt/lists/* /var/cache/apt/*
 RUN update-ca-certificates