replace 02-remove-prometheus-data

02-remove-prometheus-data deletes /run/readsb-prometheus.prom when
the container stops
As this file is created by readsb, remove it instead in a finish script
for readsb which is run when the readsb service is stopped

rootfs/etc/s6-overlay/s6-rc.d/02-remove-prometheus-data/down

@@ -1,2 +0,0 @@
-#!/bin/sh
-exec /etc/s6-overlay/scripts/02-remove-prometheus-data-down

rootfs/etc/s6-overlay/s6-rc.d/02-remove-prometheus-data/type

@@ -1 +0,0 @@
-oneshot

rootfs/etc/s6-overlay/s6-rc.d/02-remove-prometheus-data/up

@@ -1,2 +0,0 @@
-#!/bin/sh
-exec /etc/s6-overlay/scripts/02-remove-prometheus-data-init

rootfs/etc/s6-overlay/s6-rc.d/readsb/finish

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec /etc/s6-overlay/scripts/readsb-finish

rootfs/etc/s6-overlay/scripts/02-remove-prometheus-data-init

@@ -1,7 +0,0 @@
-#!/command/with-contenv bash
-# shellcheck shell=bash disable=SC1091
-
-# dummy file to allow for graceful shutdown
-# I don't know if we need this, but it won't hurt anything
-
-exit 0