Set the locale of the PostgreSQL cluster when installing on Ubuntu [closed] - postgresql

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When installing PostgreSQL from apt on Ubuntu, the command initdb to initialize the cluster is done automatically, and the locale is set from the enviroment.
I like to have my system in en_US.UTF8, but initialize the cluster in a different locale.
For that I've tried to set the environment variable locally for apt
LOCALE=es_ES.UTF-8 LC_MESSAGES=C apt install postgresql-15
but it's not working. apt output shows:
/usr/lib/postgresql/15/bin/initdb -D /var/lib/postgresql/15/main --auth-local peer --auth-host scram-sha-256 --no-instructions
The database cluster will be initialized with locale "en_US.utf8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".
For completion a simplified version of my provision script looks like this:
MY_LOCALE="es_ES.UTF-8"
# Allow the system to use $MY_LOCALE
sed -i "s/^# ${MY_LOCALE} UTF-8/${MY_LOCALE} UTF-8/" /etc/locale.gen
locale-gen
# Uncomment these lines if $MY_LOCALE must be the default
# update-locale --reset LANG="${MY_LOCALE}" LC_CTYPE="${MY_LOCALE}"
# export LANG="${MY_LOCALE}"
# export LC_TYPE="${MY_LOCALE}"
# Set the locale locally to apt command
LOCALE="${MY_LOCALE}" LC_MESSAGES=C apt install postgresql-15
Is there any way to pass locale variables to apt/initdb on installation?
Update.
As the question is closed and no answers can be added I edit to explain my actual workaround:
MY_LOCALE="es_ES.UTF-8"
# Allow the system to use $MY_LOCALE
sed -i "s/^# ${MY_LOCALE} UTF-8/${MY_LOCALE} UTF-8/" /etc/locale.gen
locale-gen
# Uncomment these lines if $MY_LOCALE must be the default
# update-locale --reset LANG="${MY_LOCALE}" LC_CTYPE="${MY_LOCALE}"
# export LANG="${MY_LOCALE}"
# export LC_TYPE="${MY_LOCALE}"
# Backup default enviroment variables
BCK_LANG="${LANG}"
BCK_LC_CTYPE="${LC_CTYPE}"
BCK_LC_MESSAGES="${LC_MESSAGES}"
# Set the desired locale for PostgreSQL as default for the system
update-locale --reset LANG="${MY_LOCALE}" LC_CTYPE="${MY_LOCALE}" LC_MESSAGES=C
# Install PostgreSQL
apt install postgresql-15
# Restore default locale
update-locale --reset LANG="${BCK_LANG}" LC_CTYPE="${BCK_LC_CTYPE}" LC_MESSAGES="${BCK_LC_MESSAGES}"
unset BCK_LANG
unset BCK_LC_CTYPE
unset BCK_LC_MESSAGES

Answer 1

I don't think so.
The behavior of the Ubuntu packages has always annoyed me. Do what I do: drop the cluster that the packages create automatically and create it again with the configuration you want.