add optional attic push

Signed-off-by: ahuston-0 <aliceghuston@gmail.com>

utils/attic-push.bash

@@ -0,0 +1,22 @@
+#!/usr/bin/env nix
+#! nix shell nixpkgs#bash nixpkgs#jq nixpkgs#gnused nixpkgs#nixVersions.latest nixpkgs#attic-client --command bash
+
+set -x
+set -v
+set -e
+
+# retrieve all paths under 100M
+nix_paths=$(nix path-info --json --all --closure-size \
+  | jq 'map_values(.closureSize | select(. < 1e8)) | to_entries | sort_by(.value)' \
+  | jq 'map(.key) | join("\n")' | sed 's/\\n/\n/g')
+
+readarray -t nix_path_array < <(echo "$nix_paths")
+
+batchsize=10
+
+for((i=0; i < ${#nix_path_array[@]}; i+=batchsize))
+do
+    part=( "${nix_path_array[@]:i:batchsize}" )
+
+    attic push "${part[@]}"
+done