Add testing docker container based on PHP 5.4

.editorconfig

@@ -19,3 +19,6 @@ insert_final_newline = false
 
 [/version.txt]
 insert_final_newline = false
+
+[*.yml]
+indent_style = space

docker/dev/mtt-php54-apache/Dockerfile

@@ -0,0 +1,4 @@
+
+FROM php:5.4-apache
+
+RUN docker-php-ext-install mysqli

docker/dev/mtt-php54-apache/docker-compose.yml

@@ -0,0 +1,11 @@
+version: '3'
+services:
+  web:
+    build: ./
+    image: mtt-php5.4-apache
+    container_name: mtt-php54-apache
+    ports:
+    - "8080:80"
+    volumes:
+    - ../../src:/var/www/html
+    - ./php-mtt.ini:/usr/local/etc/php/conf.d/php-mtt.ini

docker/dev/mtt-php54-apache/php-mtt.ini

@@ -0,0 +1,6 @@
+
+# Since PHP 5.4 E_STRICT is included in E_ALL
+error_reporting = E_ALL
+
+#log_errors = On
+#display_errors = On