removed composer binary

Dockerfile

@@ -74,7 +74,8 @@ RUN apt-get update \
     && chmod 664 $(find /var/www/passbolt/webroot/img/public -type f) \
     && rm /etc/nginx/sites-enabled/default \
     && apt-get purge -y --auto-remove $PASSBOLT_DEV_PACKAGES \
-    && rm -rf /var/lib/apt/lists/*
+    && rm -rf /var/lib/apt/lists/* \
+    && rm /usr/local/bin/composer
 
 COPY conf/passbolt.conf /etc/nginx/conf.d/default.conf
 COPY conf/supervisord.conf /etc/supervisor/supervisord.conf

spec/docker_image/image_spec.rb

@@ -38,8 +38,8 @@ describe 'Dockerfile' do
   end
 
   describe 'php composer' do
-    it 'is installed' do
-      expect(file(composer)).to be_executable
+    it 'is not installed' do
+      expect(file(composer)).to_not exist
     end
   end