test(robost_txt): make tekton specific test execution flow

Signed-off-by: Xe Iaso <me@xeiaso.net>

test/robots_txt/tekton.sh

@@ -4,4 +4,20 @@ set -euo pipefail
 
 cd "$(dirname "$0")"
 
-exec ./test.sh
+function cleanup() {
+	pkill -P $$
+}
+
+trap cleanup EXIT SIGINT
+
+go tool anubis --help 2>/dev/null || :
+
+go run ../cmd/unixhttpd &
+
+go tool anubis \
+	--policy-fname ./anubis.yaml \
+	--use-remote-address \
+	--serve-robots-txt \
+	--target=unix://$(pwd)/unixhttpd.sock &
+
+go tool backoff-retry node ./test.mjs