Rebase to 3.20

Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM ghcr.io/linuxserver/baseimage-alpine:3.19
+FROM ghcr.io/linuxserver/baseimage-alpine:3.20
 
 # set version label
 ARG BUILD_DATE
@@ -32,6 +32,7 @@ RUN \
     /tmp/prowlarr.tar.gz -C \
     /app/prowlarr/bin --strip-components=1 && \
   echo -e "UpdateMethod=docker\nBranch=${PROWLARR_BRANCH}\nPackageVersion=${VERSION}\nPackageAuthor=[linuxserver.io](https://www.linuxserver.io/)" > /app/prowlarr/package_info && \
+  printf "Linuxserver.io version: ${VERSION}\nBuild-date: ${BUILD_DATE}" > /build_version && \
   echo "**** cleanup ****" && \
   rm -rf \
     /app/prowlarr/bin/Prowlarr.Update \