convert nix-prefetch-docker to quiet mode

utils/fetch-docker.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env nix
+#! nix shell nixpkgs#bash nixpkgs#nix-prefetch-docker --command bash
+
+# retrieves the latest image tags
+
+set -x
+set -v
+set -e
+
+script_path=$(dirname "$(readlink -f $0)")
+parent_path=$(dirname "$script_path")
+
+# a list of images to pull
+# relpath is the relative path to the parent_path where you want the file written
+# format: <image name>,<image tag>,<image architecture>,<os>,<relpath>
+images=(
+    "nextcloud,apache,amd64,linux,/systems/palatine-hill/docker/nextcloud-image/nextcloud-apache.nix"
+)
+IFS=","
+while read -r name tag arch os relpath; do
+    nix-prefetch-docker --image-name "$name" --image-tag "$tag" --arch "$arch" --os "$os" --quiet > "$parent_path/$relpath"
+    git --no-pager diff "$parent_path/$relpath"
+done<<< "${images[@]}"