Update Dockerfile

Dockerfile

@@ -24,7 +24,8 @@ RUN export DEBIAN_FRONTEND=noninteractive \
 	&& php composer-setup.php --install-dir=/usr/local/bin --filename=composer $COMPOSER_VERSION \
 	&& rm composer-setup.php composer-setup.sig /var/www/html/* \
 	&& chown $USERNAME:$USERNAME /var/www/html \
-	&& echo 'alias artisan="php artisan"' >> /etc/bash.bashrc
+	&& echo 'alias artisan="php artisan"' >> /etc/bash.bashrc \
+	&& echo 'source /etc/bash_completion' >> /etc/bash.bashrc
 
 EXPOSE 8080