Install nut-notify script in container image

Shutdown automation will behandled by `upsmon` running on each physical
machine.  This code never worked anyway.

Containerfile

@@ -8,4 +8,6 @@ RUN --mount=type=cache,target=/var/cache \
 
 COPY start.sh /
 
+COPY nut-notify.sh /usr/local/libexec/nut-notify
+
 CMD ["/start.sh"]

nut-notify.sh

@@ -0,0 +1,93 @@
+#!/bin/sh
+# vim: set ts=4 sts=4 sw=4 et :
+
+MESSAGE="$1"
+
+
+handle_online() {
+    notify_ntfy high white_check_mark,electric_plug
+}
+
+handle_onbatt() {
+    notify_ntfy high warning,battery
+}
+
+handle_lowbatt() {
+    notify_ntfy max warning,battery
+}
+
+handle_commok() {
+    notify_ntfy high white_check_mark
+}
+
+handle_commbad() {
+    notify_ntfy high warning
+}
+
+handle_replbatt() {
+    notify_ntfy default warning,battery
+}
+
+handle_nocomm() {
+    notify_ntfy high warning
+}
+
+handle_unknown() {
+    printf 'Unknown notification type %s for UPS %s: %s' \
+        "${NOTIFYTYPE}" \
+        "${UPSNAME}" \
+        "${MESSAGE}" \
+        | log -p daemon.notice
+}
+
+log() {
+    logger --id=$$ -t "${0##*/}" "$@"
+}
+
+notify_ntfy() {
+    priority="${1:-default}"
+    tags="${2}"
+
+    curl -fsSL https://ntfy.pyrocufflink.blue/alerts \
+        -o /dev/null \
+        -H 'Content-Type: text/plain' \
+        -H "Priority: ${priority}" \
+        -H "Tags: ${tags}" \
+        -d "${MESSAGE}"
+}
+
+
+printf '%s running as %d %s\n' "${0##*/}" "$(id -u)" "$(whoami)" \
+    | log -p daemon.info
+printf '%s %s %s\n' "${UPSNAME}" "${NOTIFYTYPE}" "${MESSAGE}" \
+    | log -p daemon.info
+
+PATH=/usr/bin:/bin:/usr/sbin:/sbin
+export PATH
+
+case "${NOTIFYTYPE}" in
+    ONLINE)
+        handle_online
+        ;;
+    ONBATT)
+        handle_onbatt
+        ;;
+    LOWBATT)
+        handle_lowbatt
+        ;;
+    COMMOK)
+        handle_commok
+        ;;
+    COMMBAD)
+        handle_commbad
+        ;;
+    REPLBATT)
+        handle_replbatt
+        ;;
+    NOCOMM)
+        handle_nocomm
+        ;;
+    *)
+        handle_unknown
+        ;;
+esac