Change Dockerfiles and docker-compose file

The reason for this change is to reduce the image size for the different containers

frontend/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:latest
+FROM node:slim AS build
 
 # set working directory
 WORKDIR /app
@@ -10,7 +10,9 @@ ENV PATH /app/node_modules/.bin:$PATH
 COPY package.json ./
 COPY package-lock.json ./
 
-RUN npm install
+RUN npm install && npm cache clean --force
+
+EXPOSE 3000
 
 # add app
 COPY . ./