Fixing Dockerfile (#440)

Dockerfile

@@ -7,7 +7,7 @@ ADD . /app
 
 # Install updates and NodeJS+Dependencies
 RUN apk update && apk upgrade
-RUN apk add nodejs git python build-base clang
+RUN apk add nodejs npm git python build-base clang
 
 # Upgrading NPM
 RUN npm i npm@latest -g
@@ -20,4 +20,4 @@ RUN npm run build
 EXPOSE 4002
 
 # Setting run-command
-CMD PORT=4002 npm start
+CMD PORT=4002 npm start