Dockerfile samples for cloning private repos / packages

Steps

1. create a new user (only for this purpose)
2. generate an SSH key pair for the user

ssh-keygen -t rsa -b 2048 -C username@github
# no password
# save as username@github

3. set the public key (username@github.pub) on the new account at settings/keys
4. copy the private key (username@github) to the github/ dir
5. copy / extend the Dockerfile to your needs

NOtes

do not commit the key add to .gitignore

<username>@github

the key will appear in the image layer! do not share with anyone untrusted

Usage

• script works on alpine or ubuntu (looks for apk or apt package manager)
• the script will setup the .ssh and .gitconfig files
• it will add github.com to known hosts
• it will test the connection and exit 0 if successful or exit 1 if it fails (to stop the rest of the build)