add missing helper script

Signed-off-by: Moritz Wiesinger <[email protected]>

.github/workflows/scripts/get-codeowners.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+#
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+#
+# This script checks the GitHub CODEOWNERS file for any code owners
+# of contrib components and returns a string of the code owners if it
+# finds them.
+
+set -euo pipefail
+
+get_component_type() {
+  echo "${COMPONENT}" | cut -f 1 -d '/'
+}
+
+get_codeowners() {
+  # grep arguments explained:
+  #   -m 1: Match the first occurrence
+  #   ^: Match from the beginning of the line
+  #   ${1}: Insert first argument given to this function
+  #   [\/]\?: Match 0 or 1 instances of a forward slash
+  #   \s: Match any whitespace character
+(grep -m 1 "^${1}[\/]\?\s" .github/CODEOWNERS || true) | \
+        sed 's/   */ /g' | \
+        cut -f3- -d ' '
+}
+
+if [[ -z "${COMPONENT:-}" ]]; then
+    echo "COMPONENT has not been set, please ensure it is set."
+    exit 1
+fi
+
+OWNERS="$(get_codeowners "${COMPONENT}")"
+
+if [[ -z "${OWNERS:-}" ]]; then
+    COMPONENT_TYPE=$(get_component_type "${COMPONENT}")
+    OWNERS="$(get_codeowners "${COMPONENT}${COMPONENT_TYPE}")"
+fi
+
+echo "${OWNERS}"