ci: migrate to Qiniu sandbox runner

.github/scripts/ci/restore-go-cache.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+source "${GITHUB_WORKSPACE}/.github/scripts/ci/s3-cache-common.sh"
+
+mkdir -p "${GOMODCACHE}/cache/download" "${GOPATH}/bin" "${GOCACHE}" "${GITHUB_WORKSPACE}/.cache"
+rm -rf "${GITHUB_WORKSPACE}/.cache/go/build-cache"
+
+if ! s3_cache_enabled; then
+  echo "S3 Go module cache restore skipped: missing RUNNER_S3_AK/RUNNER_S3_SK or rclone"
+  exit 0
+fi
+
+if [[ -z "${CI_GO_MOD_HASH:-}" ]]; then
+  echo "S3 Go module cache restore skipped: CI_GO_MOD_HASH is empty"
+  exit 0
+fi
+
+cache_key="${RUNNER_S3_PREFIX}/go-download/hash/${RUNNER_OS:-Linux}/${CI_GO_MOD_HASH}.tar.zst"
+archive_path="$(mktemp)"
+trap 'rm -f "${archive_path}"' EXIT
+
+if s3_cache_get "${cache_key}" "${archive_path}"; then
+  zstd -dc "${archive_path}" | tar -C "${GITHUB_WORKSPACE}/.cache" -xf -
+  echo "Restored S3 Go module download cache: ${cache_key}"
+else
+  echo "S3 Go module download cache not found: ${cache_key}"
+fi