Refine e2e-enterprise pipeline and scripts

scripts/.functions

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+# Copyright IBM Corp. 2019, 2025
+# SPDX-License-Identifier: MIT
+
+# Adapted from: https://github.com/hashicorp/vault-secrets-operator/blob/main/hack/.functions
+
+# getGH downloads files from GitHub with optional authentication
+# Usage: getGH <url> [dest_file] [num_retries]
+function getGH() {
+  local url="$1"
+  local dest="$2"
+  local num_retries="${3:-${GH_GET_RETRIES}}"
+
+  headers=(
+      '--header' "Accept: application/vnd.github+json"
+      '--header' "X-GitHub-Api-Version: 2022-11-28"
+  )
+  if [ -n "${GITHUB_TOKEN}" ]; then
+      headers+=(
+          '--header' "Authorization: Bearer ${GITHUB_TOKEN}"
+      )
+  fi
+  cmd=curl
+  opts=('-sfSL')
+  echo "Fetching ${url}"
+  if [ -z "${dest}" ]; then
+    opts+=('-O')
+  else
+    opts+=('-o' "${dest}")
+  fi
+  if [ -n "${num_retries}" ]; then
+    opts+=('--retry' "${num_retries}")
+  fi
+  ${cmd} "${opts[@]}" "${headers[@]}" "${url}"
+}