pull node and composer through docker proxy

Dockerfile

 # |--------------------------------------------------------------------------
 # | Build SCSS and JS
 # |--------------------------------------------------------------------------
-FROM node:lts-alpine AS buildJS
+FROM docker-proxy.jonasled.de/library/node:lts-alpine AS buildJS
 WORKDIR /build
 COPY . .
 RUN mkdir public/js
@@ -12,7 +12,7 @@ RUN yarn compile
 # |--------------------------------------------------------------------------
 # | Install PHP dependencies
 # |--------------------------------------------------------------------------
-FROM composer:2 AS composer
+FROM docker-proxy.jonasled.de/library/composer:2 AS composer
 WORKDIR /build
 COPY --from=buildJS /build .
 RUN composer install