ci(ananke): retry Go dependency fetch in quality gate

scripts/quality_gate.sh

@@ -19,6 +19,25 @@ QUALITY_LAST_SUCCESS=0
 QUALITY_LAST_RUN_TS=0
 QUALITY_SUCCESS_PERCENT="0.00"
 
+run_with_retry() {
+  local attempts="$1"
+  shift
+  local try=1
+  local delay=3
+  local rc=0
+  while true; do
+    "$@" && return 0
+    rc=$?
+    if [[ "${try}" -ge "${attempts}" ]]; then
+      return "${rc}"
+    fi
+    echo "[quality] retry ${try}/${attempts} after rc=${rc}: $*" >&2
+    sleep "${delay}"
+    delay=$((delay * 2))
+    try=$((try + 1))
+  done
+}
+
 read_quality_counter() {
   local key="$1"
   if [[ ! -f "${QUALITY_STATE_FILE}" ]]; then
@@ -140,7 +159,9 @@ rm -f "${COVERAGE_PROFILE}" "${COVERAGE_PERCENT_FILE}"
 printf 'failed\n' > "${BUILD_DIR}/docs-naming.status"
 
 echo "[quality] unit tests + workspace coverage profile"
-go test -coverprofile="${COVERAGE_PROFILE}" ./...
+export GOPROXY="${GOPROXY:-https://proxy.golang.org,direct}"
+run_with_retry 4 go mod download
+run_with_retry 3 go test -coverprofile="${COVERAGE_PROFILE}" ./...
 coverage_percent="$(go tool cover -func="${COVERAGE_PROFILE}" | awk '/^total:/ {gsub("%","",$3); print $3}')"
 if [[ -z "${coverage_percent}" ]]; then
   coverage_percent="0"