PDO Driver for Postgres Docker, does not install

Question

I set up a PHP + Apache environment using Docker (so far everything OK), however, I noticed that PHP does not come with the PDO_PGSQL driver installed in the image.. I searched, found some solutions but could not install/run the driver. I even tried to copy a php.ini that I already had, but it didn’t work either.

Follow below my files:

php. Dockerfile

# Imagem de origem
FROM php:7.1-fpm

# Mantenedor
LABEL maintainer="[email protected]"

# tentei copiar o ini, tambem nao funcionou.
# ADD php.ini /usr/local/etc/php

# ====== DRIVERS PHP ========
#
# -> PDO MYSQL
# RUN docker-php-ext-install mysqli pdo_mysql
#
# -> PDO POSTGRESQL
# RUN apt-get update && apt-get install -y libpq-dev && docker-php-ext-install pdo_pgsql # Nao funciona
#
#
# tentei assim, porém, tambem nao funciona.
RUN apt-get update && apt-get install -y libpq-dev \
&& docker-php-ext-configure pgsql -with-pgsql=/usr/local/pgsql \
&& docker-php-ext-install pdo_pgsql \
&& apt-get clean

apache. Dockerfile

# Imagem de origem
FROM php:apache

# Mantenedor
LABEL maintainer="[email protected]"

# Setando o modo de reescrita de URL no apache.
RUN a2enmod rewrite

Docker-Compose.yml

version: "3" 
services:
# Servidor Apache
apache:
    build:
      dockerfile: apache.Dockerfile
      context: ./Docker/apache
    volumes:
      - "./app/src:/var/www/html"
    ports:
      - "80:80"
    depends_on:
      - php
    container_name: apache

  # Codigos da aplicação
  php:
    build:
      dockerfile: teste.Dockerfile
      context: ./Docker/php
    volumes:
      - "./app/src:/var/www/html"
    ports:
      - "9000:9000"
    container_name: php

Even following some tutorials, reading the doc I could not solve the problem. Containers mount and no error is returned, however when running phpinfo() I see that the only existing PDO driver is sqlite.

That’s it, thanks to anyone who can help!