fix: add set -eou pipefail and redirect stderr to stdout

Author: thebengeu

ansible/files/start-envoy.sh

@@ -1,4 +1,5 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
+set -eou pipefail
 # Workaround using `tee` to get `/dev/stdout` access logging to work, see:
 # https://github.com/envoyproxy/envoy/issues/8297#issuecomment-620659781
-exec /opt/envoy --config-path /etc/envoy/envoy.yaml --restart-epoch "$RESTART_EPOCH" | tee
+exec /opt/envoy --config-path /etc/envoy/envoy.yaml --restart-epoch "$RESTART_EPOCH" 2>&1 | tee