PR #3 scrubbed L@ker$2010 from every env file, compose unit, and
deployment doc but missed scripts/setup-database.sh, which still hard-
coded DB_PASSWORD="L@ker\$2010" on line 17. That slipped past
gitleaks because the shell-escaped form (backslash-dollar) does not
match the L@kers?\$?2010 regex committed in .gitleaks.toml -- the
regex was written to catch the *expanded* form, not the source form.
This commit removes the hardcoded default and requires DB_PASSWORD to
be exported by the operator before running the script. Same pattern as
the rest of the PR #3 conversion (fail-fast at boot when a required
secret is unset) so there is no longer any legitimate reason for the
password string to live in the repo.
Verification:
git grep -nE 'L@kers?\\?\$?2010' -- scripts/ # no matches
bash -n scripts/setup-database.sh # clean
