You are getting an error like this:
The unauthenticated git protocol on port 9418 is no longer supported.
and/or you get this:
fatal: unable to access ... server certificate verification failed.
For solving the first error you need to change the URLs in your npm package.json from "git://..." to "https://...".
Further information:
OK. So far so good.
Then you might get this error on "npm install":
fatal: unable to access 'https://github.com/some-user/awesome-library-project.git/': server certificate verification failed. CAfile: none CRLfile: none
Assuming that you use something like
FROM node:12.22.1-buster-slim
as the base image for your Docker image, the following is what you will need to do. Note that the node "buster" image is based on Debian Linux.
Add the following to your Dockerfile (before the npm install step!):
RUN sudo apt-get install apt-transport-https ca-certificates -y
RUN sudo update-ca-certificates
"sudo" might not be necessary, in that case you can leave it away. There is even a shorter version in one line:
apt-get install apt-transport-https ca-certificates -y && update-ca-certificates
What it does is to update the list list of public root CA (certificate authorities) known to the system (but it's not a solution for private certificates!).
That should fix the error and make your Docker image building again!