Container v1.6.0 built from source not working

While the pulled image works great
```
docker pull alfg/nginx-rtmp
docker run -it -p 1935:1935 -p 8080:80 --rm alfg/nginx-rtmp
```
the image built from the source (v1.6.0) does not:
```
docker build -t nginx-rtmp .
docker run -it -p 1935:1935 -p 8080:80 --rm nginx-rtmp

```
When I try to stream from OBS I got this logged:
```
2023/09/05 17:59:12 [info] 11#11: *1 exec: starting managed child 'ffmpeg', client: 192.168.1.23, server: [0.0.0.0:1935](http://0.0.0.0:1935/)
2023/09/05 17:59:12 [notice] 11#11: signal 17 (SIGCHLD) received from 13
2023/09/05 17:59:12 [alert] 11#11: unknown process 13 exited on signal 11
2023/09/05 17:59:13 [info] 11#11: *1 exec: child 13 exited; ignoring, client: 192.168.1.23, server: [0.0.0.0:1935](http://0.0.0.0:1935/)
2023/09/05 17:59:13 [info] 11#11: *1 exec: terminating child 13, client: 192.168.1.23, server: [0.0.0.0:1935](http://0.0.0.0:1935/)
```
Any help is appreciated.