smtp.json / smtp.yaml are not loaded properly

Describe the bug

Haraka does not load smtp.yaml or smtp.json if smtp.ini does not exist.

Expected behavior

Haraka should either crash although smtp.json or smtp.yaml is present or it should load one of them.

Observed behavior

The existence of smtp.json or smtp.yaml prevents Haraka from crashing. See this check.

Steps To Reproduce

haraka --install "${HARAKA_HOME}"
first case: rm "${HARAKA_HOME}/config/smtp.ini"
- Haraka does crash when started.
second case: mv "${HARAKA_HOME}/config/smtp.ini" "${HARAKA_HOME}/config/smtp.yaml"
- Haraka does not crash when started.
- When putting log statements in the config loader, one can observe that only smtp.ini is requested. smtp.yaml or smtp.json are never requested.
- If a JSON / HJSON file is not found, the loader checks whether the same file with .yaml exists (see here). This is not done for INI files.

System Info:

Haraka	Haraka.js — Version: 3.0.1
Node	v19.7.0
OS	Linux 060427c22453 6.2.8-arch1-1 haraka/Haraka#1 SMP PREEMPT_DYNAMIC Wed, 22 Mar 2023 22:52:35 +0000 x86_64 Linux
openssl	OpenSSL 3.0.8 7 Feb 2023 (Library: OpenSSL 3.0.8 7 Feb 2023)

Additional context

Haraka runs inside an Alpine Docker container with Alpine version 3.17.2.

haraka / haraka-config