Merge pull request dunglas#10 from dunglas/build-arg

Allow to use Symfony 4

Author: dunglas

Dockerfile

@@ -43,8 +43,11 @@ RUN composer global require "hirak/prestissimo:^0.3" --prefer-dist --no-progress
 COPY docker/app/docker-entrypoint.sh /usr/local/bin/docker-app-entrypoint
 RUN chmod +x /usr/local/bin/docker-app-entrypoint
 
+# Allow to use development versions of Symfony
+ARG STABILITY=stable
+ENV STABILITY ${STABILITY}
+
 # Download the Symfony skeleton and leverage Docker cache layers
-ENV STABILITY stable
 RUN composer create-project "symfony/skeleton" . --stability=$STABILITY --prefer-dist --no-dev --no-progress --no-scripts --no-plugins --no-interaction
 
 COPY . .