build: take bullseye and buster packages from archive.debian.org

Debian has archived both: buster is gone from deb.debian.org and
bullseye's security pool there now 404s on packages its index still
lists (run 6: xz-utils, dpkg-dev, libdpkg-perl). archive.debian.org
serves both releases, including libpcap 1.8.1-6+deb10u1 for the static
link.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UHXzGrsxfkGk8LmwrBbHNZ

reweave/build/Dockerfile

@@ -32,6 +32,9 @@ ENV DEB_CROSSPLATFORMS \
 RUN <<EOCROSSCOMPILERS
 set -e
 echo 'Acquire::Retries "6";' > /etc/apt/apt.conf.d/80-retries
+# bullseye (this base) and buster (libpcap below) are archived: deb.debian.org
+# no longer serves all their packages, archive.debian.org does
+sed -i 's|http://deb.debian.org|http://archive.debian.org|g' /etc/apt/sources.list
 for platform in ${DEB_CROSSPLATFORMS}; do dpkg --add-architecture $platform; done 
 apt-get update
 apt-get install -y build-essential
@@ -48,8 +51,8 @@ EOCROSSCOMPILERS
 # Install libpcap-dev version 1.8.1-6+deb10u1 for all supported
 # architectures.
 RUN <<EOBUSTERREPOS
-echo "deb http://deb.debian.org/debian/ buster main" > /etc/apt/sources.list.d/busters-repos.list
-echo "deb-src http://deb.debian.org/debian/ buster main" >> /etc/apt/sources.list.d/busters-repos.list
+echo "deb http://archive.debian.org/debian/ buster main" > /etc/apt/sources.list.d/busters-repos.list
+echo "deb-src http://archive.debian.org/debian/ buster main" >> /etc/apt/sources.list.d/busters-repos.list
 apt-get update
 for platform in ${DEB_CROSSPLATFORMS}; do apt-get install -y libpcap0.8:${platform}=1.8.1-6+deb10u1 libpcap0.8-dev:${platform}=1.8.1-6+deb10u1 libpcap-dev:${platform}=1.8.1-6+deb10u1; done
 EOBUSTERREPOS