Migrate from bullseye to bookworm

* Pin bookworm explicitly in parent container image tags
* Update references to bullseye

bookworm/hooks/build

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+ 
+docker build --target=bookworm-base -t $DOCKER_REPO:latest -t $DOCKER_REPO:base ${SCRIPT_DIR}/..

bookworm/hooks/push

@@ -0,0 +1,2 @@
+#!/bin/bash
+docker push --all-tags ${DOCKER_REPO}