Bugfix: Default action on nginx unit image

[mvhirsch]

Spinning up an 8.1-unit image and HTTPing always tries to redirect:

curl -v http://127.0.0.1:8000/
*   Trying 127.0.0.1:8000...
* Connected to 127.0.0.1 (127.0.0.1) port 8000
> GET / HTTP/1.1
> Host: 127.0.0.1:8000
> User-Agent: curl/8.9.1
> Accept: */*
> 
* Request completely sent off
< HTTP/1.1 301 Moved Permanently
< Location: //
< Server: Unit/1.32.1
< Date: Tue, 25 Mar 2025 15:48:40 GMT
< Content-Length: 0
< 
* Connection #0 to host 127.0.0.1 left intact

Comparing with release/8.3 (which works), showed a slight diff :-)

[en-jschuetze]

Good find! Merged!