Add Docker support for development

Dockerfile

@@ -2,8 +2,8 @@ FROM php:7.2-cli-buster
 
 RUN apt-get update && \
 	apt-get install -y autoconf pkg-config && \
-    pecl channel-update pecl.php.net && \
-    pecl install xdebug && \
+	pecl channel-update pecl.php.net && \
+	pecl install xdebug && \
 	docker-php-ext-enable opcache xdebug
 
 RUN echo '\
@@ -13,13 +13,14 @@ xdebug.start_with_request=yes\n\
 ' >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
 
 RUN echo '\
+display_errors=On\n\
+error_reporting=E_ALL\n\
 date.timezone=UTC\n\
 ' >> /usr/local/etc/php/conf.d/php.ini
 
-ENV PHP_IDE_CONFIG serverName=icanboogie-session-tests
 ENV COMPOSER_ALLOW_SUPERUSER 1
 
 RUN apt-get update && \
 	apt-get install unzip && \
-    curl -s https://raw.githubusercontent.com/composer/getcomposer.org/76a7060ccb93902cd7576b67264ad91c8a2700e2/web/installer | php -- --quiet && \
-    mv composer.phar /usr/local/bin/composer
+	curl -s https://raw.githubusercontent.com/composer/getcomposer.org/76a7060ccb93902cd7576b67264ad91c8a2700e2/web/installer | php -- --quiet && \
+	mv composer.phar /usr/local/bin/composer

Makefile

@@ -1,7 +1,6 @@
 # customization
 
 PACKAGE_NAME = icanboogie/session
-PACKAGE_VERSION = 3.0
 PHPUNIT = vendor/bin/phpunit
 
 # do not edit the following lines
@@ -11,11 +10,11 @@ usage:
 	@echo "test:  Runs the test suite.\ndoc:   Creates the documentation.\nclean: Removes the documentation, the dependencies and the Composer files."
 
 vendor:
-	@COMPOSER_ROOT_VERSION=$(PACKAGE_VERSION) composer install
+	@composer install
 
 .PHONY: update
 update:
-	@COMPOSER_ROOT_VERSION=$(PACKAGE_VERSION) composer update
+	@composer update
 
 test-dependencies: vendor
 
@@ -44,7 +43,7 @@ doc: vendor
 	@apigen generate \
 	--source lib \
 	--destination build/docs/ \
-	--title "$(PACKAGE_NAME) v$(PACKAGE_VERSION)" \
+	--title "$(PACKAGE_NAME)" \
 	--template-theme "bootstrap"
 
 .PHONY: clean

docker-compose.yml

@@ -3,7 +3,9 @@ version: "3.2"
 services:
   app:
     build: .
+    environment:
+      PHP_IDE_CONFIG: 'serverName=icanboogie-session-tests'
     volumes:
     - .:/app:delegated
-    - ~/.composer:/root/.composer
+    - ~/.composer:/root/.composer:delegated
     working_dir: /app