MAPG-7 install nodejs, uglify-js and clean-css into the Docker image

cleanup Docker files

docker/scripts/install-composer.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-EXPECTED_CHECKSUM="$(curl -s https://composer.github.io/installer.sig)"
+EXPECTED_CHECKSUM="$(curl -sL https://composer.github.io/installer.sig)"
 php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
 ACTUAL_CHECKSUM="$(php -r "echo hash_file('sha384', 'composer-setup.php');")"