Docker tweaks

client/Dockerfile

@@ -1,20 +1,23 @@
 FROM node:11-alpine
 LABEL maintainer="Ocean Protocol <devops@oceanprotocol.com>"
 
-RUN apk add --no-cache --update\
-    bash\
-    g++\
-    gcc\
-    git\
-    gettext\
-    make\
-    python
+RUN apk add --no-cache --update \
+    bash \
+    g++ \
+    gcc \
+    git \
+    gettext \
+    make \
+    python \
+    && rm -rf /var/cache/apk/*
+
+COPY package*.json /app/frontend/
+WORKDIR /app/frontend
+RUN npm install -g npm serve \
+    && npm install \
+    && npm cache clean --force
 
 COPY . /app/frontend
-WORKDIR /app/frontend
-
-RUN npm install -g npm serve
-RUN npm install
 RUN npm run build
 
 # Default ENV values