symfony postgres connection with custom schema does not work - postgresql

Question

When using database_name.my_schema on a remote database it tells me that db does not exists, but if I use only the database_name it seems to connect, but when I run
RUN php bin/console doctrine:migrations:migrate --no-interaction
on Dockerfile it fails to connect.
On /config/packages/doctrine.yaml
doctrine:
dbal:
dbname : 'my_db' // or dbname.myschema
user : 'user'
password : 'xxxxxxxx'
host : 'xxxxxxxx'
port: 1520
driver : 'pdo_pgsql'
server_version: '13'
The Dockerfile
FROM php:8.1-apache AS symfony_php
RUN a2enmod rewrite
RUN apt-get update \
&& apt-get install -y libpq-dev libzip-dev git libxml2-dev wget --no-install-recommends \
&& docker-php-ext-configure pgsql -with-pgsql=/usr/local/pgsql \
&& docker-php-ext-install pdo pdo_pgsql pgsql zip \
&& apt-get clean \
&& rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
RUN wget https://getcomposer.org/download/2.3.5/composer.phar \
&& mv composer.phar /usr/bin/composer && chmod +x /usr/bin/composer
COPY docker/php/apache.conf /etc/apache2/sites-enabled/000-default.conf
COPY docker/php/php.ini /usr/local/etc/php/conf.d/app.ini
COPY . /var/www
WORKDIR /var/www
RUN composer install
RUN php bin/console doctrine:migrations:migrate --no-interaction
RUN mkdir ./var/cache/pfv && mkdir ./var/log/pfv && chmod -R 777 ./var/cache && chmod -R 777 ./var/lo
So, the questions are what is the correct setup for postgres with custom schema and why when apparently it connects with just de database name, the migration command fails.
EDIT
Error thrown:
[critical] Error thrown while running command "doctrine:migrations:migrate --no-interaction". Message: "An exception occurred in the driver: SQLSTATE[08006] [7] timeout expired"
In ExceptionConverter.php line 81:
An exception occurred in the driver: SQLSTATE[08006] [7] timeout expired