remove S6 settings which are no longer necessary / startup service improvements

Dockerfile

@@ -5,10 +5,7 @@
 
 FROM ghcr.io/sdr-enthusiasts/docker-baseimage:wreadsb
 
-ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2 \
-    S6_SERVICES_GRACETIME=20000 \
-    S6_KILL_GRACETIME=20000 \
-    BEASTPORT=30005 \
+ENV BEASTPORT=30005 \
     GITPATH_TIMELAPSE1090=/opt/timelapse1090 \
     HTTP_ACCESS_LOG="false" \
     HTTP_ERROR_LOG="true" \

rootfs/etc/s6-overlay/s6-rc.d/startup/down

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

rootfs/etc/s6-overlay/scripts/startup

@@ -10,9 +10,11 @@ if ! [[ -d "$SDIR" ]] || [[ -z "$(ls "$SDIR")" ]]; then
     exit 0
 fi
 
-for NAME in "$SDIR"/*; do
-    if ! s6wrap --quiet --prepend="$NAME" --timestamps --args "$NAME"; then
-        s6wrap --quiet --prepend=startup --timestamps --args echo Error running "$NAME"
+cd "$SDIR" || exit 1
+
+for NAME in *; do
+    if ! s6wrap --quiet --prepend="$NAME" --timestamps --args "$SDIR/$NAME"; then
+        s6wrap --quiet --prepend=startup --timestamps --args echo Error running "$SDIR/$NAME"
         exit 1
     fi
 done

rootfs/etc/s6-overlay/scripts/startup-finish

@@ -0,0 +1,20 @@
+#!/command/with-contenv bash
+# shellcheck shell=bash disable=SC1091,SC2076
+
+source /scripts/common
+
+SDIR=/etc/s6-overlay/finish.d
+
+# exit 0 for nonexistent or empty directory
+if ! [[ -d "$SDIR" ]] || [[ -z "$(ls "$SDIR")" ]]; then
+    exit 0
+fi
+
+cd "$SDIR" || exit 1
+
+for NAME in *; do
+    if ! s6wrap --quiet --prepend="$NAME" --timestamps --args "$SDIR/$NAME"; then
+        s6wrap --quiet --prepend=startup --timestamps --args echo Error running "$SDIR/$NAME"
+        exit 1
+    fi
+done

rootfs/etc/s6-overlay/startup.d/01-sanity-check

@@ -25,7 +25,7 @@ fi
 
 # Set up timezone
 if [ -z "${TZ}" ]; then
-  echo "${YELLOW}WARNING: TZ environment variable not set${NOCOLOR}"
+  echo -e "${YELLOW}WARNING: TZ environment variable not set${NOCOLOR}"
 else
   ln -snf "/usr/share/zoneinfo/$TZ" /etc/localtime && echo "$TZ" >/etc/timezone
 fi