ci: add berlin.guix.gnu.org to substitute URLs list

Author: kwvg

contrib/containers/guix/Dockerfile

@@ -52,8 +52,9 @@ RUN guix_file_name=guix-binary-${guix_version}.$(uname -m)-linux.tar.xz
 
 RUN touch /etc/nsswitch.conf
 
-RUN guix archive --authorize < /usr/local/guix/current/share/guix/ci.guix.gnu.org.pub && \
-    guix archive --authorize < /usr/local/guix/current/share/guix/bordeaux.guix.gnu.org.pub
+RUN guix archive --authorize < /usr/local/guix/current/share/guix/berlin.guix.gnu.org.pub && \
+    guix archive --authorize < /usr/local/guix/current/share/guix/bordeaux.guix.gnu.org.pub && \
+    guix archive --authorize < /usr/local/guix/current/share/guix/ci.guix.gnu.org.pub
 
 # Build Environment Setup
 # https://guix.gnu.org/manual/en/html_node/Build-Environment-Setup.html

contrib/containers/guix/scripts/entrypoint

@@ -8,7 +8,7 @@ cat /etc/motd
 # Start the Guix daemon
 sudo env PATH=${PATH} guix-daemon \
   --build-users-group='guixbuild' \
-  --substitute-urls='https://bordeaux.guix.gnu.org https://ci.guix.gnu.org' < /dev/null 2>&1 |
+  --substitute-urls='https://berlin.guix.gnu.org https://bordeaux.guix.gnu.org https://ci.guix.gnu.org' < /dev/null 2>&1 |
   sudo tee /var/log/guix.log > /dev/null &
 
 # Hand over control