add default values to docker installation - closes issue #37

.env

@@ -1,4 +1,4 @@
-DB_HOSTNAME=localhost
+DB_HOSTNAME=db
 DB_USER=root
-DB_PASSWORD=abcxyz
+DB_PASSWORD=root
 DB_DATABASE=learning-with-texts

Dockerfile

@@ -9,8 +9,8 @@ RUN docker-php-ext-install pdo pdo_mysql mysqli
 COPY . /var/www/html/
 
 # creating connect.inc.php
-ARG DB_HOSTNAME
-ARG DB_USER
-ARG DB_PASSWORD
-ARG DB_DATABASE
+ARG DB_HOSTNAME=db
+ARG DB_USER=root
+ARG DB_PASSWORD=root
+ARG DB_DATABASE=learning-with-texts
 RUN printf '<?php\n$server = "%s";\n$userid = "%s";\n$passwd = "%s";\n$dbname = "%s";\n?>' "$DB_HOSTNAME" "$DB_USER" "$DB_PASSWORD" "$DB_DATABASE" > /var/www/html/connect.inc.php

docker-compose.yml

@@ -5,13 +5,15 @@ services:
       context: .
       dockerfile: Dockerfile
       args:
-        - DB_HOSTNAME
-        - DB_USER
-        - DB_PASSWORD
-        - DB_DATABASE
+        - DB_HOSTNAME=db
+        - DB_USER=root
+        - DB_PASSWORD=root
+        - DB_DATABASE=learning-with-texts
     container_name: lwt
     depends_on:
       - db
+    links:
+      - db
     ports:
       - "8010:80"
     restart: unless-stopped
@@ -26,4 +28,4 @@ services:
     volumes:
         - lwt_db_data:/var/lib/mysql
 volumes:
-  lwt_db_data:
+  lwt_db_data: {}