Restore Homebrew and Debian package manager support

- Add Homebrew formula (brew_dist/archivebox.rb) using virtualenv pattern
  with auto-generation via homebrew-pypi-poet in bin/build_brew.sh
- Add Debian packaging via nFPM (pkg/debian/) with thin .deb that pip-installs
  archivebox into /opt/archivebox/venv on postinstall
- Add build/release scripts: bin/{build,release}_{brew,deb}.sh
- Update CI workflows to build packages on release and test them
- Update README apt/brew install instructions with working commands
- Update bin/setup.sh to use .deb download instead of old Launchpad PPA

https://claude.ai/code/session_01Vx1EsNrNySgsc8Y67dGzCn

bin/build_brew.sh

@@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+
+### Bash Environment Setup
+# http://redsymbol.net/articles/unofficial-bash-strict-mode/
+# https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html
+# set -o xtrace
+set -o errexit
+set -o errtrace
+set -o nounset
+set -o pipefail
+IFS=$'\n'
+
+REPO_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && cd .. && pwd )"
+cd "$REPO_DIR"
+
+VERSION="$(grep '^version = ' "${REPO_DIR}/pyproject.toml" | awk -F'"' '{print $2}')"
+FORMULA_FILE="$REPO_DIR/brew_dist/archivebox.rb"
+
+echo "[+] Building Homebrew formula for archivebox==${VERSION}..."
+
+# Create a temporary virtualenv for generating the formula
+TMPDIR="$(mktemp -d)"
+trap "rm -rf $TMPDIR" EXIT
+
+python3 -m venv "$TMPDIR/venv"
+source "$TMPDIR/venv/bin/activate"
+
+pip install --quiet "archivebox==${VERSION}" homebrew-pypi-poet 2>/dev/null
+
+echo "[+] Generating resource stanzas with homebrew-pypi-poet..."
+RESOURCES="$(poet archivebox)"
+
+# Get the sdist URL and SHA256 from PyPI
+SDIST_URL="$(pip download --no-binary :all: --no-deps -d "$TMPDIR/sdist" "archivebox==${VERSION}" 2>&1 | grep -oP 'https://\S+\.tar\.gz' | head -1 || true)"
+if [ -z "$SDIST_URL" ]; then
+    SDIST_URL="https://files.pythonhosted.org/packages/source/a/archivebox/archivebox-${VERSION}.tar.gz"
+fi
+SDIST_SHA256="$(pip hash "$TMPDIR/sdist/"*.tar.gz 2>/dev/null | grep 'sha256:' | cut -d: -f2 || echo '')"
+
+deactivate
+
+echo "[+] Updating formula file: $FORMULA_FILE"
+
+# Build the formula from the template
+cat > "$FORMULA_FILE" << RUBY
+# This formula is auto-generated by bin/build_brew.sh using homebrew-pypi-poet.
+# To update: run bin/build_brew.sh, or trigger the GitHub Actions homebrew workflow.
+#
+# Users install with:
+#   brew tap archivebox/archivebox
+#   brew install archivebox
+
+class Archivebox < Formula
+  include Language::Python::Virtualenv
+
+  desc "Self-hosted internet archiving solution"
+  homepage "https://github.com/ArchiveBox/ArchiveBox"
+  url "${SDIST_URL}"
+  sha256 "${SDIST_SHA256}"
+  license "MIT"
+  head "https://github.com/ArchiveBox/ArchiveBox.git", branch: "dev"
+
+  depends_on "python@3.13"
+  depends_on "node"
+  depends_on "git"
+  depends_on "wget"
+  depends_on "curl"
+  depends_on "ripgrep"
+  depends_on "yt-dlp"
+
+  # Python dependency resource blocks auto-generated by homebrew-pypi-poet
+  # AUTOGENERATED_RESOURCES_START
+${RESOURCES}
+  # AUTOGENERATED_RESOURCES_END
+
+  def install
+    virtualenv_install_with_resources
+  end
+
+  def post_install
+    # Install runtime dependencies (plugins, JS extractors, etc.)
+    system bin/"archivebox", "install", "--binproviders", "pip,npm"
+  end
+
+  service do
+    run [opt_bin/"archivebox", "server", "--quick-init", "0.0.0.0:8000"]
+    keep_alive crashed: true
+    working_dir var/"archivebox"
+    log_path var/"log/archivebox.log"
+    error_log_path var/"log/archivebox.log"
+  end
+
+  test do
+    assert_match version.to_s, shell_output("#{bin}/archivebox version")
+  end
+end
+RUBY
+
+echo "[√] Formula updated: $FORMULA_FILE"
+echo "    Version: ${VERSION}"
+echo "    URL: ${SDIST_URL}"