fix: SERVE_ROBOTS_TXT works again (#1229)

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

test/robots_txt/test.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+function cleanup() {
+	pkill -P $$
+}
+
+trap cleanup EXIT SIGINT
+
+# Build static assets
+(cd ../.. && npm ci && npm run assets)
+
+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 &
+
+backoff-retry node ./test.mjs