[librsvg-oci-images/add-curl-to-debian] Do not copy the scripts, run them in place

[Sven Neumann <sneumann src gnome org>]

commit f4662c7c2be2746891cca52e500d8d764f9c7877
Author: Sven Neumann <sven svenfoo org>
Date:   Wed Oct 28 19:04:47 2020 +0100

    Do not copy the scripts, run them in place

 debian/testing | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/debian/testing b/debian/testing
index aaae483..d6e29f6 100644
--- a/debian/testing
+++ b/debian/testing
@@ -1,9 +1,7 @@
 FROM debian:testing
 
-COPY prepare.sh cleanup.sh /root/
-
-RUN /bin/sh /root/prepare.sh && \
-    /bin/sh /root/cleanup.sh
+RUN /bin/sh debian/prepare.sh && \
+    /bin/sh debian/cleanup.sh
 
 ENV SHELL=/bin/bash