docker: update to Debian 12 (Bookworm)

Update parent image to bookworm.
This allows us to remove all the backports and also to build Ubuntu
images again as it requires dpkg zstd support.

Signed-off-by: Klaus Goger <klaus.goger@theobroma-systems.com>

docker/Dockerfile

@@ -3,7 +3,7 @@ ARG DEBIAN_FRONTEND=noninteractive
 ARG GOPATH=/usr/local/go
 
 ### first stage - builder ###
-FROM debian:bullseye-slim as builder
+FROM debian:bookworm-slim as builder
 
 ARG DEBIAN_FRONTEND
 ARG GOPATH
@@ -26,24 +26,8 @@ COPY . $GOPATH/src/github.com/go-debos/debos
 WORKDIR $GOPATH/src/github.com/go-debos/debos/cmd/debos
 RUN go install ./...
 
-# Pull the latest archlinux-keyring, since the one in Debian is outdated
-# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1026080
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
-        pkgconf \
-        python3-all \
-        sq \
-        systemd && \
-    rm -rf /var/lib/apt/lists/*
-
-RUN git clone https://gitlab.archlinux.org/archlinux/archlinux-keyring && \
-    cd archlinux-keyring && \
-    git checkout -B latest-release 20221213 && \
-    make build && \
-    make PREFIX=/usr KEYRING_TARGET_DIR=/usr/share/keyrings/ DESTDIR=/arch-keyring install
-
 ### second stage - runner ###
-FROM debian:bullseye-slim as runner
+FROM debian:bookworm-slim as runner
 
 ARG DEBIAN_FRONTEND
 ARG GOPATH
@@ -96,26 +80,16 @@ RUN apt-get update && \
         rsync \
         systemd \
         systemd-container \
+        systemd-resolved \
         u-boot-tools \
         unzip \
         user-mode-linux \
         xfsprogs \
         xz-utils \
-        zip && \
-    rm -rf /var/lib/apt/lists/*
-
-# Enable backports for the Arch dependencies
-RUN echo "deb http://ftp.debian.org/debian bullseye-backports main" >> /etc/apt/sources.list
-
-# NOTE: Explicitly install arch-install-scripts from backports. The normal one
-# lacks pactrap.
-# Install Arch dependencies
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
+        zip \
         makepkg \
-        pacman-package-manager && \
-    apt-get install -y --no-install-recommends \
-        -t bullseye-backports \
+        pacman-package-manager \
+        archlinux-keyring \
         arch-install-scripts && \
     rm -rf /var/lib/apt/lists/*
 
@@ -127,8 +101,4 @@ RUN for arch in aarch64 alpha arm armeb cris hexagon hppa m68k microblaze mips m
 
 COPY --from=builder $GOPATH/bin/debos /usr/local/bin/debos
 
-# Pull the latest archlinux-keyring, since the one in Debian is outdated
-# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1026080
-COPY --from=builder /arch-keyring/ /
-
 ENTRYPOINT ["/usr/local/bin/debos"]