feat(agent): docker-based cross-compile for linux binaries

agent/scripts/build-linux.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# Produce Linux Burrito binaries for the agent.
+# Usage: ./scripts/build-linux.sh [output_dir]
+set -euo pipefail
+
+cd "$(dirname "$0")/.."
+OUT="${1:-$(pwd)/dist}"
+mkdir -p "$OUT"
+
+IMG="proxmox-monitor-agent-build:latest"
+
+docker build -f Dockerfile.build -t "$IMG" .
+docker run --rm -v "$OUT":/out "$IMG" sh -c 'cp -v burrito_out/* /out/'
+
+echo
+echo "Binaries written to $OUT:"
+ls -la "$OUT"