set .env variable to database credentials

.env.sample

@@ -3,3 +3,6 @@ COMPOSE_FILE=docker-compose.yml:traefik.yml
 
 HOST=passbolt.DOMAINE.FR
 NAME=passbolt
+
+MYSQL_USER=
+MYSQL_PASSWORD=

docker-compose.yml

@@ -6,8 +6,8 @@ services:
     environment:
       MYSQL_RANDOM_ROOT_PASSWORD: "true"
       MYSQL_DATABASE: "passbolt"
-      MYSQL_USER: "passbolt"
-      MYSQL_PASSWORD: "P4ssb0lt"
+      MYSQL_USER: ${MYSQL_USER}
+      MYSQL_PASSWORD: ${MYSQL_PASSWORD}
     volumes:
       - database_volume:/var/lib/mysql
 
@@ -19,11 +19,11 @@ services:
     depends_on:
       - db
     environment:
-      APP_FULL_BASE_URL: http://localhost
+      APP_FULL_BASE_URL: http://${HOST}
       DATASOURCES_DEFAULT_HOST: "db"
-      DATASOURCES_DEFAULT_USERNAME: "passbolt"
-      DATASOURCES_DEFAULT_PASSWORD: "P4ssb0lt"
       DATASOURCES_DEFAULT_DATABASE: "passbolt"
+      DATASOURCES_DEFAULT_USERNAME: ${MYSQL_USER}
+      DATASOURCES_DEFAULT_PASSWORD: ${MYSQL_PASSWORD}
     volumes:
       - gpg_volume:/etc/passbolt/gpg
       - jwt_volume:/etc/passbolt/jwt