This project supplements the scratch container with the ca certificates of /etc/ssl/certs from the Ubuntu trusty Linux image.
An easy way to grab tge CA certs files to run an interactive shell with trusy and to copy the file to your local drive.
To run an interactive terminal session in trusty:
docker run -v $PWD:/foo -it ubuntu:trusty
Then in your trusty session install the certs and copy them to the directory you mapped to you local drive. The commands are:
apt-get update -y apt-get install -y ca-certificates cp /etc/ssl/certs/ca-certificates.crt /foo
Once you have ca-certificates.crt in place you can create the image using make.
This was inspired by the a codeship blog article