STA-928|add PDO-postgress, add fmp ver php, rm volume

Dockerfile

-FROM php:alpine
-
-VOLUME ./:./app
+FROM php:fpm-alpine
 
 WORKDIR app
 
 COPY . .
 
+RUN apk update && \
+    apk add libpq-dev && \
+    docker-php-ext-install pdo pdo_pgsql pgsql
 
 ENV COMPOSER_ALLOW_SUPERUSER=1
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer