chore: add which-release script (#18657)

scripts/which-release.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# shellcheck source=scripts/lib.sh
+source "$(dirname "${BASH_SOURCE[0]}")/lib.sh"
+
+COMMIT=$1
+if [[ -z "${COMMIT}" ]]; then
+	log "Usage: $0 <commit-ref>"
+	log ""
+	log -n "Example: $0 "
+	log $'$(gh pr view <pr-num> --json mergeCommit | jq \'.mergeCommit.oid\' -r)'
+	exit 2
+fi
+
+REMOTE=$(git remote -v | grep coder/coder | awk '{print $1}' | head -n1)
+if [[ -z "${REMOTE}" ]]; then
+	error "Could not find remote for coder/coder"
+fi
+
+log "It is recommended that you run \`git fetch -ap ${REMOTE}\` to ensure you get a correct result."
+
+RELEASES=$(git branch -r --contains "${COMMIT}" | grep "${REMOTE}" | grep "/release/" | sed "s|${REMOTE}/||" || true)
+if [[ -z "${RELEASES}" ]]; then
+	log "Commit was not found in any release branch"
+else
+	log "Commit was found in the following release branches:"
+	log "${RELEASES}"
+fi