[Bug]: PG17 Broken Docker Hydra's pipeline for tests

### What's wrong?

When compile for PG17, Docker Hydra's pipeline is broken for tests.

https://github.com/hydradatabase/hydra/issues/272#issuecomment-2596086769

I try to launch tests using Docker, modified for this `docker-build.sh`. Added `--target checker` to launch checker stage.
```
docker build --progress=plain --target checker -t $REPO:$TAG .
```

And got an error:
```
# initializing database system by copying initdb template
# copying of initdb template failed
# Examine "/columnar/src/test/regress/log/initdb.log" for the reason.
# Command was: cp -RPp "/tmp_install/initdb-template" "/columnar/src/test/regress/tmp_check/data" > "/columnar/src/test/regress/log/initdb.log" 2>&1
Bail out!make[1]: *** [Makefile:27: check-regression-columnar] Error 2
make[1]: Leaving directory '/columnar/src/test/regress'
make: *** [Makefile:49: check-all] Error 2
```

initdb.log contains
```
cp: cannot stat '/tmp_install/initdb-template': No such file or directory
```