clean up apk/apt caches

dockerfiles/bookworm.Dockerfile

@@ -5,6 +5,7 @@ WORKDIR /app
 
 RUN <<EOT
   apt-get update -qq
+  rm -rf /var/lib/apt/lists /var/cache/apt/archives
   gem update --system --no-document
   gem install -N bundler
 EOT
@@ -18,6 +19,7 @@ ENV BUNDLE_DEPLOYMENT=true \
 RUN <<EOT
   apt-get update -qq
   apt-get install --yes --no-install-recommends gcc make libc-dev
+  rm -rf /var/lib/apt/lists /var/cache/apt/archives
 EOT
 
 COPY Gemfile* .