podman-compose config optimize

podman-compose version 1.2.0
podman version 5.2.2

`podman-compose config`
```
services:
librespeed:
container_name: librespeed
environment:
CUSTOM_RESULTS: 'false'
DB_TYPE: sqlite
PASSWORD: scwx602942
TZ: Asia/Shanghai
hostname: Arc
image: lscr.io/linuxserver/librespeed:latest
ports:
- 6080:80❗
restart: unless-stopped
```
The indentation of the port field seems to be abnormal. But it does not affect the use.
The original file content is as follows：
```
---
services:
librespeed:
image: lscr.io/linuxserver/librespeed:latest
container_name: librespeed
hostname: Arc
environment:
- TZ=Asia/Shanghai
- PASSWORD=ps
- CUSTOM_RESULTS=false #optional
- DB_TYPE=sqlite #optional
ports:
- 6080:80❗
restart: unless-stopped
```

Reproduce the reported output with podman-compose config using the provided Podman and podman-compose versions, then compare it with the original compose file. Trace the config command's output-generation entry point and verify that the port field uses normal YAML indentation without changing the configuration semantics.

Written by the indexing model from the issue text.