replace watchtower with custom script

systems/palatine-hill/docker/watchtower.bash

@@ -0,0 +1,24 @@
+#! /usr/bin/env nix
+#! nix shell nixpkgs#docker nixpkgs#bash --command bash
+
+outdated_msg="Project code is out of date and needs to be upgraded. To remedy this problem immediately, you may reboot your warrior."
+
+label="$1"
+label_val="$2"
+
+if (( $# != 2 )); then
+    echo "usage: $0 label label_value"
+fi
+
+containers=$(docker ps --format '{{.Names}}' -f "label=${label}=${label_val}")
+
+for container in ${containers[@]}; do
+  echo "checking ${container}"
+
+  last_msg=$(docker logs -n 1 "${container}")
+
+  if [[ $last_msg =~ $outdated_msg ]]; then
+    echo "${container} is outdated, restarting"
+    systemctl restart "docker-${container}"
+  fi
+done