[etherpad-web] Fix permissions under /opt/app-root as well

[Andrea Veri <averi src gnome org>]

commit 8faccaad064d42dd38e573f902c0c9cd724cd3d1
Author: Andrea Veri <av gnome org>
Date:   Wed Feb 5 00:39:31 2020 +0000

    Fix permissions under /opt/app-root as well

 Dockerfile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index bc0791b..92f59d9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,7 +33,8 @@ RUN npm install ep_adminpads \
 
 RUN /opt/etherpad/bin/fix-permissions.sh /opt/etherpad && \
     /opt/etherpad/bin/fix-permissions.sh /.npm && \
-    /opt/etherpad/bin/fix-permissions.sh /.config
+    /opt/etherpad/bin/fix-permissions.sh /.config \
+    /opt/etherpad/bin/fix-permissions.sh /opt/app-root
 
 # Run as a random user. This happens on openshift by default so we
 # might as well always run as a random user