[gimp-web/oscp] testing.docs.gimp.org: install librsvg2-bin.

[Jehan <jehanp src gnome org>]

commit ad908bada8778f08efe642ff175ef1fbe761f99f
Author: Jehan <jehan girinstud io>
Date:   Thu Feb 24 00:34:10 2022 +0100

    testing.docs.gimp.org: install librsvg2-bin.
    
    Should fix:
    
    > /bin/bash: line 1: rsvg-convert: command not found

 testing.docs.gimp.org/docs_build/Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/testing.docs.gimp.org/docs_build/Dockerfile b/testing.docs.gimp.org/docs_build/Dockerfile
index a01a2a47..d690739b 100644
--- a/testing.docs.gimp.org/docs_build/Dockerfile
+++ b/testing.docs.gimp.org/docs_build/Dockerfile
@@ -4,7 +4,7 @@ USER root
 RUN apt-get update && apt-get install -y --no-install-recommends \
     automake build-essential docbook-xml docbook-xsl pkg-config \
     pngcrush pngnq python3 python3-libxml2 xsltproc gettext git \
-    ca-certificates rsync docbook-website
+    ca-certificates rsync docbook-website librsvg2-bin
 
 RUN groupadd gimpdocs -g 1000580000 && \
     useradd gimpdocs -g 1000580000 -u 1000580000 -r -l -m