Add a Steam release export script pointed at production

project.godot stays checked in against UAT (us3q.ranaze.com) so the
Godot editor/debugger keeps testing against UAT. This script patches a
local copy to prd/s3q.ranaze.com just for the Windows Desktop export -
the same swap web/Dockerfile already does for UAT vs PRD web builds -
runs the export, then always restores the original file.

Verified: after a run, `git diff project.godot` is clean and the
exported .pck contains s3q.ranaze.com with no trace of us3q.ranaze.com.

tools/export_steam_release.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# Exports the Windows Desktop build against production endpoints, for Steam
+# release. project.godot stays checked in pointing at UAT (us3q.ranaze.com)
+# so the Godot editor/debugger keeps hitting UAT - this script patches a
+# local copy just for the export, the same way web/Dockerfile patches
+# project.godot for the UAT/PRD web builds, then restores the original file
+# even if the export fails.
+set -euo pipefail
+
+REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+PROJECT_FILE="${REPO_ROOT}/project.godot"
+BACKUP_FILE="${PROJECT_FILE}.steam-release.bak"
+GODOT_BIN="${GODOT_BIN:-/z/Godot/Godot_v4.6.2-stable_win64_console.exe}"
+OUTPUT_PATH="${1:-build/windows/RanaZe.exe}"
+
+cleanup() {
+  if [ -f "${BACKUP_FILE}" ]; then
+    mv -f "${BACKUP_FILE}" "${PROJECT_FILE}"
+  fi
+}
+trap cleanup EXIT
+
+cp "${PROJECT_FILE}" "${BACKUP_FILE}"
+
+BUILD_REVISION="$(git -C "${REPO_ROOT}" rev-parse HEAD)"
+sed -i \
+  -e "s|deployment_environment=\"development\"|deployment_environment=\"prd\"|" \
+  -e "s|build_revision=\"development\"|build_revision=\"${BUILD_REVISION}\"|" \
+  -e "s|https://us3q.ranaze.com|https://s3q.ranaze.com|g" \
+  "${PROJECT_FILE}"
+
+mkdir -p "${REPO_ROOT}/$(dirname "${OUTPUT_PATH}")"
+"${GODOT_BIN}" --headless --export-release "Windows Desktop" "${OUTPUT_PATH}" --path "${REPO_ROOT}"
+
+echo "Steam release build exported to ${OUTPUT_PATH} (production endpoints, revision ${BUILD_REVISION})."