[gimp-web/oscp] Missing libxslt

[Andrea Veri <averi src gnome org>]

commit d2490ef930c00f833a87faf790044e48df4d5879
Author: Andrea Veri <averi redhat com>
Date:   Fri Mar 13 22:11:56 2020 +0100

    Missing libxslt

 docs.gimp.org/docs_build/Dockerfile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/docs.gimp.org/docs_build/Dockerfile b/docs.gimp.org/docs_build/Dockerfile
index 23bb844a..ebb213f3 100644
--- a/docs.gimp.org/docs_build/Dockerfile
+++ b/docs.gimp.org/docs_build/Dockerfile
@@ -3,7 +3,8 @@ USER root
 
 COPY entrypoint.sh /tmp/entrypoint.sh
 RUN yum install -y docbook-dtds docbook-style-dsssl docbook-style-xsl rsync \
-                   docbook-utils-pdf docbook-utils git autoconf automake make
+                   docbook-utils-pdf docbook-utils git autoconf automake make \
+                   libxslt
 
 RUN groupadd gimpdocs -g 1000580000 && \
     useradd gimpdocs -g 1000580000 -u 1000580000 -r -l -m