feat: debian packaging, release pipeline, and build scripts

- debian/postinst: create daena user, directories, reload systemd
- debian/prerm: stop and disable service on removal
- scripts/build-deb.sh: build self-contained .deb with all deps
- CI: add release job triggered by v* tags, builds wheel + .deb,
  uploads both to GitHub Release

scripts/build-deb.sh

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+VERSION="${1:-0.1.0}"
+PACKAGE="daena_${VERSION}_all"
+BUILDROOT="/tmp/build/${PACKAGE}"
+DISTDIR="dist"
+
+pip install uv --quiet
+uv sync --no-dev --frozen --quiet
+
+# Create package directory structure
+rm -rf "${BUILDROOT}"
+mkdir -p "${BUILDROOT}/DEBIAN"
+mkdir -p "${BUILDROOT}/usr/bin"
+mkdir -p "${BUILDROOT}/usr/lib/python3/dist-packages"
+mkdir -p "${BUILDROOT}/lib/systemd/system"
+mkdir -p "${BUILDROOT}/etc/daena"
+
+# Install the package and all dependencies into dist-packages
+uv pip install --python "$(which python3)" \
+    --target="${BUILDROOT}/usr/lib/python3/dist-packages" \
+    --no-compile \
+    . 2>/dev/null
+
+# Install script entry points
+cat > "${BUILDROOT}/usr/bin/daena" << 'SCRIPT'
+#!/usr/bin/env python3
+from daena.cli.main import app
+app()
+SCRIPT
+chmod +x "${BUILDROOT}/usr/bin/daena"
+
+cat > "${BUILDROOT}/usr/bin/daena-serve" << 'SCRIPT'
+#!/usr/bin/env python3
+from daena.app import serve
+serve()
+SCRIPT
+chmod +x "${BUILDROOT}/usr/bin/daena-serve"
+
+# Install systemd service
+cp deploy/daena.service "${BUILDROOT}/lib/systemd/system/daena.service"
+
+# Install default config
+cp config/daena.yaml "${BUILDROOT}/etc/daena/daena.yaml"
+
+# Install maintainer scripts
+cp debian/postinst "${BUILDROOT}/DEBIAN/postinst"
+cp debian/prerm "${BUILDROOT}/DEBIAN/prerm"
+chmod 755 "${BUILDROOT}/DEBIAN/postinst" "${BUILDROOT}/DEBIAN/prerm"
+
+# Compute installed size (in KB)
+INSTALLED_SIZE=$(du -sk "${BUILDROOT}" | cut -f1)
+
+# Generate control file
+cat > "${BUILDROOT}/DEBIAN/control" << CONTROL
+Package: daena
+Version: ${VERSION}
+Section: utils
+Priority: optional
+Architecture: all
+Maintainer: Amir Husayn Panahifar <ahp@panahifar.ir>
+Installed-Size: ${INSTALLED_SIZE}
+Depends: python3 (>= 3.13), python3-pip, liblmdb0
+Recommends: systemd
+Description: Collect, buffer, and forward logs and events
+ Daena is a modular, extensible Linux service that collects
+ logs, events, and telemetry from pluggable sources, processes
+ them through a configurable pipeline, persists data locally
+ in LMDB, and forwards records reliably to remote sinks.
+CONTROL
+
+# Build .deb
+mkdir -p "${DISTDIR}"
+fakeroot dpkg-deb --build "${BUILDROOT}" "${DISTDIR}/${PACKAGE}.deb"
+
+echo "Built: ${DISTDIR}/${PACKAGE}.deb"