/.github/{scripts,workflows}: iterating on pr comment benchmarking

.github/scripts/performance-benchmarking/validate-commentor.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -e
+
+if [[ $# -ne 1 ]]; then
+  echo "Usage: ./validate-commentor.sh COMMENTOR"
+  exit 1
+fi
+
+validcommentors="coffeegoddd andrew-wm-arthur bheni Hydrocharged katiemcculloch oscarbatori reltuk tbantle22 timsehn VinaiRachakonda zachmu"
+
+contains() {
+    [[ $1 =~ (^|[[:space:]])$2($|[[:space:]]) ]] && echo "::set-output name=valid::true" || exit 0
+}
+
+contains "$validcommentors" "$1"