Updated docker configuration

Dockerfile

@@ -0,0 +1,2 @@
+FROM php:7.2.2-apache
+RUN docker-php-ext-install mysqli pdo pdo_mysql

README.md

@@ -31,10 +31,10 @@ existing colors.
 ## start
 To run the program execute:
 ```bash
-  docker-compose up -d
+  bash ./start.sh
 ```
 ## test
 To run the tests execute:
 ```bash
-  test.sh
+  bash ./test.sh
 ```

docker-compose.yml

@@ -11,7 +11,7 @@ services:
     ports:
       - "9906:3306"
   web:
-    image: php:7.2.2-apache
+    build: .
     container_name: php_web
     depends_on:
       - db

start.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+docker-compose up -d

test.sh

@@ -1,2 +1,2 @@
 #!/bin/bash
-(cd ./src && php -d memory_limit=128M vendor/bin/phpunit)
+docker exec -ti php_web php -d memory_limit=128M vendor/bin/phpunit