Rebase to 3.20

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ghcr.io/linuxserver/baseimage-alpine-nginx:3.19
+FROM ghcr.io/linuxserver/baseimage-alpine-nginx:3.20
 
 # set version label
 ARG BUILD_DATE
@@ -9,9 +9,6 @@ ARG HEIMDALL_RELEASE
 LABEL build_version="Linuxserver.io version:- ${VERSION} Build-date:- ${BUILD_DATE}"
 LABEL maintainer="aptalca"
 
-# environment settings
-ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2
-
 RUN \
   echo "**** install runtime packages ****" && \
   apk add --no-cache \
@@ -45,6 +42,7 @@ RUN \
   tar xf \
     /tmp/heimdall.tar.gz -C \
     /app/www-tmp --strip-components=1 && \
+  printf "Linuxserver.io version: ${VERSION}\nBuild-date: ${BUILD_DATE}" > /build_version && \
   echo "**** cleanup ****" && \
   rm -rf \
     /tmp/*