Sleep before rsync to avoid remote file locking issue

Author: faern

ci/linux-repository-builder/build-linux-repositories.sh

@@ -135,6 +135,10 @@ function rsync_repo {
     local remote_repo_dir=$2
 
     echo "Syncing to $repository_server_upload_domain:$remote_repo_dir"
+    # We have an issue where the rsync can fail due to the remote dir being locked (only one rsync at a time allowed)
+    # We suspect this is because of too fast subsequent invocations of rsync to the same target dir. With a hacky sleep
+    # we hope to avoid this issue for now.
+    sleep 10
     rsync -av --delete --mkpath --rsh='ssh -p 1122' \
         "$local_repo_dir"/ \
         build@"$repository_server_upload_domain":"$remote_repo_dir"