Security Fixes

Removing NPM from the image since it's not necessary and it becomes vulnerable very often. Updating node alpine image, so it will have newer yarn version (not vulnerable).

List of Vulnerabilities getting fixed:
- https://nvd.nist.gov/vuln/detail/CVE-2020-8131
- https://nvd.nist.gov/vuln/detail/CVE-2020-8116
- https://nvd.nist.gov/vuln/detail/CVE-2019-10773

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:12.13-alpine
+FROM node:12.16.1-alpine
 # ref: https://hub.docker.com/_/node?tab=tags&name=12
 
 LABEL maintainer="Jupyter Project <[email protected]>"
@@ -10,7 +10,8 @@ RUN mkdir -p /srv/configurable-http-proxy
 COPY . /srv/configurable-http-proxy
 WORKDIR /srv/configurable-http-proxy
 RUN npm install -g
-
+RUN npm audit fix
+RUN npm uninstall -g npm
 # Switch from the root user to the nobody user
 USER 65534