Prepare 2.3.0 release and Linux Docker workflows

scripts/docker-build-windows.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+image='batonogov/pyinstaller-windows:latest'
+container_id="$(docker create --platform linux/amd64 \
+  --env PYTHONUTF8=1 --env PYTHONIOENCODING=utf-8 \
+  "$image" 'python build.py --skip-installer')"
+trap 'docker rm -f "$container_id" > /dev/null 2>&1 || true' EXIT
+
+docker cp . "$container_id:/src"
+docker start -a "$container_id" || true
+status="$(docker inspect --format '{{.State.ExitCode}}' "$container_id")"
+if [ "$status" -ne 0 ]; then
+  echo "PyInstaller container failed with exit code $status" >&2
+  exit "$status"
+fi
+
+mkdir -p dist
+docker cp "$container_id:/src/dist/." dist/