PHP is unable to see env var when runing in docker - docker

Question

I have this docker-compose config.
The "app" is a PHP application. As you can see, 3 env vars are passed to the container.
However, after docker-compose up, PHP doesn't see these. They are not returned by getenv() and they cannot be found $_ENV either.
What's wrong here?
version: '3.4'
services:
db:
image: postgres:11.0
restart: always
environment:
POSTGRES_PASSWORD: testuser
POSTGRES_USER: test
POSTGRES_DB: db
volumes:
- /data/db
redis:
image: redis:latest
restart: always
volumes:
- /data/redis
app:
build:
context: .
dockerfile: Dockerfile
environment:
- DATABASE_URL=postgresql://db:5432/db
- REDIS_URL=tcp://redis:6379?database=1
- NODE_ENV=development
ports:
- '80:80'
volumes:
- '${BASEDIR}:/var/www/some'
Here is my Dockerfile:
FROM ubuntu:18.04
ENV DEBIAN_FRONTEND=noninteractive
RUN apt-get update && apt-get install -y \
software-properties-common \
apt-utils \
tzdata \
locales
RUN add-apt-repository ppa:ondrej/php
RUN apt-get update
RUN locale-gen en_US.UTF-8
RUN echo "Europe/Budapest" > /etc/timezone && dpkg-reconfigure -f noninteractive tzdata
RUN apt-get -y update && apt-get -y install \
libglu1-mesa \
less \
vim \
nginx \
php7.4 \
php7.4-fpm \
php7.4-cli \
php7.4-common \
php7.4-curl \
php-deepcopy \
php7.4-gd \
php7.4-mbstring \
php7.4-pgsql \
php7.4-soap \
php7.4-xdebug \
php7.4-zip \
php7.4-xml \
phpunit \
npm && npm i -g npm
ENV NGINX_RUN_USER www-data
ENV NGINX_RUN_GROUP www-data
ENV NGINX_LOG_DIR /var/log/nginx
ENV NGINX_LOCK_DIR /var/lock/nginx
ENV NGINX_PID_FILE /run/nginx.pid
RUN mkdir www
RUN mkdir -p /var/www/dbv.local/html
RUN chmod -R 755 /var/www/dbv.local
COPY ./php.ini /etc/php/7.4/fpm/php.ini
COPY ./dbv.local /etc/nginx/sites-available/dbv.local
COPY ./lib/aspose_php.so /usr/lib/php/20190902
COPY ./lib/libaspose_cpp_clang3_libstdcpp.so /usr/lib/libaspose_cpp_clang3_libstdcpp.so
COPY ./lib/libAspose.Slides_clang3_libstdcpp.so /usr/lib/libAspose.Slides_clang3_libstdcpp.so
COPY ./lib/libphpcpp.so.2.2 /usr/lib/libphpcpp.so.2.2
RUN echo "daemon off;" >> /etc/nginx/nginx.conf
RUN ln -s /etc/nginx/sites-available/dbv.local /etc/nginx/sites-enabled/
ADD ./xdebug.ini /etc/php/7.4/mods-available/xdebug.ini
ADD ./aspose_php.ini /etc/php/7.4/mods-available/aspose_php.ini
ADD ./start.sh /root/start.sh
RUN ln -s /etc/php/7.4/mods-available/xdebug.ini /etc/php/7.4/mods-available/20-xdebug.ini
RUN ln -s /etc/php/7.4/mods-available/aspose_php.ini /etc/php/7.4/fpm/conf.d/aspose_php.ini
RUN ln -s /etc/php/7.4/mods-available/aspose_php.ini /etc/php/7.4/cli/conf.d/aspose_php.ini
RUN rm -rf /var/lib/apt/lists/*
RUN apt-get clean
CMD ["/root/start.sh"]
EXPOSE 80 9000 5432
Edit:
start.sh is just a one liner
service php7.4-fpm start && nginx
Ubuntu 18 is necessary. I could use an official Nginx image though. Maybe that's the issue?