test: add a dev-util script for looking at slow TAV jobs in CI

dev-utils/ci-tav-slow-jobs.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+#
+# List the jobs for the latest "TAV" workflow run in GH Actions, **sorted by
+# slowest last**. This is used for finding very slow build steps as candidates
+# for improvement.
+#
+# Usage:
+#   ./dev-utils/ci-tav-slow-jobs.sh
+#
+# The columns are:
+#   1. duration in seconds
+#   2. duration in "NNmNNs"
+#   3. the job name
+
+if [ "$TRACE" != "" ]; then
+    export PS4='${BASH_SOURCE}:${LINENO}: ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
+    set -o xtrace
+fi
+set -o errexit
+set -o pipefail
+
+branch=main
+branch=test/action-tav
+latestTavRun=$(gh run list -R elastic/apm-agent-nodejs -b "$branch" -w TAV -L 1 --json databaseId --jq '.[].databaseId')
+gh api --paginate repos/elastic/apm-agent-nodejs/actions/runs/$latestTavRun/jobs \
+    | json -ga jobs \
+    | json -ga -e '
+        this.s = (new Date(this.completed_at) - new Date(this.started_at)) / 1000;
+        this.minSec = Math.floor(this.s/60) + "m" + (this.s%60).toString().padStart(2,"0") + "s"
+        ' s minSec name \
+    | sort -n