Added proper creation of mysql user, removal of default homestead user

docker-compose.yml

@@ -112,16 +112,17 @@ services:
 ### MySQL Container #########################################
 
     mysql:
-        build: ./mysql
+        build: 
+            context: ./mysql
+            args:
+                - MYSQL_DATABASE=homestead
+                - MYSQL_USER=homestead
+                - MYSQL_PASSWORD=secret
+                - MYSQL_ROOT_PASSWORD=root
         volumes:
             - mysql:/var/lib/mysql
         ports:
             - "3306:3306"
-        environment:
-            MYSQL_DATABASE: homestead
-            MYSQL_USER: homestead
-            MYSQL_PASSWORD: secret
-            MYSQL_ROOT_PASSWORD: root
 
 ### MariaDB Container #######################################
 

mysql/Dockerfile

@@ -2,8 +2,26 @@ FROM mysql:5.6
 
 MAINTAINER Mahmoud Zalt <mahmoud@zalt.me>
 
+ADD startup /etc/mysql/startup
+
+RUN chown -R mysql:root /var/lib/mysql/
+
+ARG MYSQL_DATABASE=homestead
+ARG MYSQL_USER=homestead
+ARG MYSQL_PASSWORD=secret
+ARG MYSQL_ROOT_PASSWORD=root
+
+ENV MYSQL_DATABASE=$MYSQL_DATABASE
+ENV MYSQL_USER=$MYSQL_USER
+ENV MYSQL_PASSWORD=$MYSQL_PASSWORD
+ENV MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD
+
+RUN sed -i 's/MYSQL_DATABASE/'$MYSQL_DATABASE'/g' /etc/mysql/startup && \
+    sed -i 's/MYSQL_USER/'$MYSQL_USER'/g' /etc/mysql/startup && \
+    sed -i 's/MYSQL_PASSWORD/'$MYSQL_PASSWORD'/g' /etc/mysql/startup
+
 ADD my.cnf /etc/mysql/conf.d/my.cnf
 
-CMD ["mysqld"]
+CMD ["mysqld", "--init-file=/etc/mysql/startup"]
 
 EXPOSE 3306

mysql/startup

@@ -0,0 +1,3 @@
+DROP USER 'homestead';
+CREATE DATABASE IF NOT EXISTS MYSQL_DATABASE;
+GRANT ALL ON `MYSQL_DATABASE`.* TO 'MYSQL_USER'@'%' IDENTIFIED BY 'MYSQL_PASSWORD';