ci-config: use new bincache server

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

Author: tormath1

ci-automation/ci-config.env

@@ -9,7 +9,7 @@
 #  - http and https (WITHOUT auto-redirect)
 #  - ssh for BUILDCACHE_USER
 BUILDCACHE_SERVER="${BUILDCACHE_SERVER:-bincache.flatcar-linux.net}"
-BUILDCACHE_PATH_PREFIX="/srv/bincache"
+BUILDCACHE_PATH_PREFIX="/mnt/buckets/linode-bincache"
 BUILDCACHE_USER="bincache"
 
 RELEASES_SERVER="mirror.release.flatcar-linux.net"