[etherpad-web/oscp-backend] Restore ep_set_title_on_pad and ep_markdown

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit bab56663e37df0ee0c2e4ad4c6902ed2b1f70e05
Author: Bartłomiej Piotrowski <bpiotrowski gnome org>
Date:   Fri Dec 18 10:50:21 2020 +0100

    Restore ep_set_title_on_pad and ep_markdown

 Dockerfile | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)
---
diff --git a/Dockerfile b/Dockerfile
index 941e457..ea86929 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,13 +23,15 @@ ADD entrypoint.sh /entrypoint.sh
 
 USER etherpad
 WORKDIR /opt/etherpad
-RUN bin/installDeps.sh && rm settings.json && rm -rf ~/.npm/_cacache
-
-RUN npm install ep_adminpads \
-    ep_align \
-    ep_spellcheck \
-    ep_headings2 \
-    ep_font_color
+RUN bin/installDeps.sh && rm settings.json && \
+    npm install ep_adminpads \
+      ep_align \
+      ep_spellcheck \
+      ep_headings2 \
+      ep_font_color \
+      ep_set_title_on_pad \
+      ep_markdown && \
+    rm -rf ~/.npm/_cacache
 
 USER etherpad
 EXPOSE 9001