specify 'connections' option for dummy script in CI manually

[PetrShumilov]

Fix such behavior:

Linking stage started...
[49958][2025-11-17 10:47:29.089497 limits.cpp   88] failed to set rlimit for open files: Operation not permitted. Try running as root or requesting smaller maxconns value.
[49958][2025-11-17 10:47:29.089523 php-engine.cpp 2400] fatal: cannot raise open file limit to 65552
Error: Process completed with exit code 1.