push

.env

 #Change le port hôte sur lequel on se connecte au conteneur
 HOST_PORT=8080
+MYSQL_ROOT_PASSWORD=root

Dockerfile

 FROM debian:stable
 RUN apt-get update && apt-get -y install apache2 php cron
+CMD ["/bin/bash"]

apachephp/Dockerfile

+FROM debian:stable
+RUN apt-get update && apt-get -y install apache2 php cron

docker-compose.yml

 version: '3.9'
 services:
   front:
-    image: ./Dockerfile
+    image: rss/image-apachephp:latest
+    build:
+      context: apachephp
+      dockerfile: Dockerfile
     environment:
       HOST_PORT:
     ports:
@@ -13,6 +16,12 @@ services:
       - db
   db:
     image: mysql
+    # NOTE: use of "mysql_native_password" is not recommended: https://dev.mysql.com/doc/refman/8.0/en/upgrading-from-previous-series.html#upgrade-caching-sha2-password
+    # (this is just an example, not intended to be a production configuration)
+    command: --default-authentication-plugin=mysql_native_password
+    restart: always
+    environment:
+      MYSQL_ROOT_PASSWORD:
     networks:
       - db
 networks: