Intermittent test failure: BIO_connect

Seen at https://github.com/alxndrsn/odk-central/actions/runs/13581526470/job/37968452360

```
[test-images.sh] Checking response from / ...
[test-images.sh] !!! Retry count exceeded.
[test-images.sh] !!! Final response:

40D7A9BC0D7F0000:error:8000006F:system library:BIO_connect:Connection refused:../crypto/bio/bio_sock2.c:114:calling connect()
40D7A9BC0D7F0000:error:10000067:BIO routines:BIO_connect:connect error:../crypto/bio/bio_sock2.c:116:
connect:errno=111
```

## nginx container logs

```
...
nginx-1 | Generating DH parameters, 2048 bit long safe prime
```

## 2026-04-04

https://github.com/getodk/central/actions/runs/23971704393/job/69922297521

```
[test-images.sh] Checking response from / ...
[test-images.sh] !!! Retry count exceeded.
[test-images.sh] !!! Final response:

40D7548A817F0000:error:8000006F:system library:BIO_connect:Connection refused:../crypto/bio/bio_sock2.c:183:calling connect()
40D7548A817F0000:error:10000067:BIO routines:BIO_connect:connect error:../crypto/bio/bio_sock2.c:185:
connect:errno=111
```

```
nginx-1 | writing client config...
nginx-1 | .+......+.+.....+....+.....+......+...+.........+.+++++++++++++++++++++++++++++++++++++++*...................+.........+.+......+...+...........+++++++++++++++++++++++++++++++++++++++*...+.........+.+...+..+.......+............+.........+.....+....+..+.+...............+.....+...+....+...+............+........+.............+.........+..+...+.+......+......+..................+...........+.+..+.......+...+.....+...+....+...+..+.+.................+...+....+.........+..+...+.........+.+............+........+..........+.....+....+...........+....+......+..+............+.++++++
nginx-1 | .....+......+........+.+........+...+...+......+.+...+..+...+....+..+.+..+...............+......+.......+..+.+......+...+..+++++++++++++++++++++++++++++++++++++++*.+..+...............+......+++++++++++++++++++++++++++++++++++++++*....+......+........+......+.........+.......++++++
nginx-1 | -----
nginx-1 | Generating DH parameters, 2048 bit long safe prime
```

---

-----

Maybe just a timeout?

# TODO

- [x] confirm build passes when re-run
- [x] ~print logs at end of `test-images` job?~ [already happening]