Add containers for php and composer and adapt gitignore

.gitignore

@@ -1,3 +1,3 @@
 .idea
 app/php/vendor
-/var/
+var/*

README.md

@@ -14,11 +14,11 @@ docker-compose up -d
 Install needed PHP dependencies
 
 ```
-cd app && composer install
+docker-compose run --rm composer composer install --ignore-platform-reqs
 ```  
 
 Execute the PHP sample application
 
 ```
-php app/php/app.php -a fo1 -b bar
+docker-compose run --rm php php app.php -a fo1 -b bar
 ```

app/php/app.php

@@ -19,15 +19,15 @@
 $log->pushHandler($stdoutHandler);
 
 // File Handler
-$fileHandler = new RotatingFileHandler('../var/logs/app.log', 0, Logger::DEBUG);
+$fileHandler = new RotatingFileHandler('/logs/app.log', 0, Logger::DEBUG);
 $formatter = new JsonFormatter();
 $fileHandler->setFormatter($formatter);
 $log->pushHandler($fileHandler);
 
 // Elasticsearch Handler
 $elasticaClient = new Client(
     [
-        'host' => 'localhost',
+        'host' => 'elasticsearch',
         'port' => 9200
     ]
 );

docker-compose.yml

@@ -38,7 +38,7 @@ services:
     user: root
     volumes:
       - './var/filebeat/log/:/var/log/:ro'
-      - './var/filebeat/docker.sock:/var/run/docker.sock'
+      - '/var/run/docker.sock:/var/run/docker.sock'
       - './var/logs/:/var/lib/docker/containers/logs:ro'
       - './etc/filebeat/filebeat.yml:/usr/share/filebeat/filebeat.yml'
     command: ["--strict.perms=false"]
@@ -52,3 +52,19 @@ services:
     depends_on:
       - elasticsearch
 
+  composer:
+    image: composer:2.1
+    container_name: composer
+    working_dir: /app
+    volumes:
+      - './app/php:/app'
+
+  php:
+    image: php:8.0-fpm
+    container_name: php
+    working_dir: /app
+    depends_on:
+      - elasticsearch
+    volumes:
+      - './app/php:/app'
+      - './var/logs:/logs'