How to add a custom CA-Certificate on an extended (node.js) docker image

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I'm extending the node-red docker image which (currently) bases itself on the node:6docker image.

I would like to add a custom SSL-Certificate into the docker-image's certificate store. Up to now I did this as follow: 

FROM nodered/node-red-docker

ADD DigiCertCA.crt /usr/local/share/ca-certificates/
RUN update-ca-certificates

ADD settings.js /data/settings.js

RUN npm install node-red-contrib-ttn
RUN npm install node-red-contrib-influxdb
RUN npm install node-red-admin
RUN npm install node-red-node-geohash 

CMD ["npm", "start", "--", "--userDir", "/data"]

Building this image fails, because the RUN is executed as non-root user node. 

Updating certificates in /etc/ssl/certs... ln: failed to create symbolic link '/etc/ssl/certs/DigiCertCA.pem': Permission denied
The command '/bin/sh -c update-ca-certificates' returned a non-zero code: 1

I'm aware that as non-root such an operation is not possible. But what's the valid concept to extend existing images with custom CA-Certificates?

node-red dockerfile docker node.js ssl
2 Answers

Why not just switch user to root to run the command to add the cert then switch back?

FROM nodered/node-red-docker

ADD DigiCertCA.crt /usr/local/share/ca-certificates/
USER root
RUN update-ca-certificates
USER node-red


ADD settings.js /data/settings.js

RUN npm install node-red-contrib-ttn
RUN npm install node-red-contrib-influxdb
RUN npm install node-red-admin
RUN npm install node-red-node-geohash 

CMD ["npm", "start", "--", "--userDir", "/data"]
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