Include auth.json to install dependencies in docker

.gitignore

@@ -1 +1,4 @@
 .DS_Store
+
+# Magento authentication file
+auth.json

README.md

@@ -17,8 +17,10 @@
 
 <ol>
 <li> Install docker and docker-compose.
-<li> Run the following script: <code><em>docker-compose up</em></code> </li>
-<li> Wait the container to start (it may take a while)</li>
+<li> Create a `auth.json` file copying it from `auth.json.example` according to https://experienceleague.adobe.com/docs/commerce-cloud-service/user-guide/develop/authentication-keys.html?lang=en.</li>
+<li> Run the following script: <code><em>docker-compose up</em></code>.</li>
+<li> Wait the container to start (it may take a while).</li>
+<li> Run `composer install` inside the magento container.<li>
 </ol>
 
 ### Install manually

auth.json.example

@@ -0,0 +1,8 @@
+{
+    "http-basic": {
+        "repo.magento.com": {
+            "username": "<USERNAME>",
+            "password": "<PASSWORD>"
+        }
+    }
+}

docker-compose.yml

@@ -22,6 +22,7 @@ services:
     volumes:
       - magento_data:/bitnami/magento
       - .:/bitnami/magento/vendor/mondu/magento2-payment/
+      - ./auth.json:/bitnami/magento/auth.json
     depends_on:
       mariadb:
         condition: service_healthy