add update script

pkgs/adam-site/update.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p jq nix-prefetch-git
+
+set -e
+
+PACKAGE_FILE="default.nix" # Replace with your package file path
+REPO_URL="git@github.com:oberprofis/adams.git" # Replace with the repository URL
+
+echo "Fetching latest revision from $REPO_URL..."
+
+# Get the latest revision and sha256
+latest_rev=$(nix-prefetch-git $REPO_URL | jq -r '.rev')
+
+echo "Latest revision: $latest_rev"
+
+# Update the package file with the new revision and sha256
+sed -i "s|rev = \".*\";|rev = \"$latest_rev\";|" $PACKAGE_FILE
+
+echo "Package file $PACKAGE_FILE updated successfully."
+