update Dockerfile some more

.dockerignore

-src/
-ldap_connexion_config.json
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+node_modules/
+src/
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Dockerfile

-FROM node:10.9-alpine
+FROM mhart/alpine-node:10.9
 
-CMD [ "node", "build/bundle.js" ]
+# Create app directory
+WORKDIR /app
+
+# Install app dependencies
+COPY package*.json ./
+
+# Native dependencies
+RUN apk add --no-cache make gcc g++ python
+
+RUN npm install --only=production
+
+# Bundle app source
+COPY . .
+
+EXPOSE 3000
+CMD [ "node", "build/bundle.js" ]
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