I am trying to link a username and password to a github repo using the shared credentials e.g. githubCredentials, which equals (myuser, mypassword) and then ave the user choose githubCredentials as the username and password to prevent people entering in the wrong password, which then locks the github account.
Yes, you can do this (for a plain git repo)! If it's not working then something is going wrong.
If you have Two Factor Authentication (2FA) enabled on your GitHub account, then you may need to create a personal access token. There's also an Atlassian knowledge base article about this: Two-Factor Authentication (2FA) with GitHub in Bamboo
If you're not using 2FA, and there's no obvious error that tells you what's going wrong, then you can try reproducing the issue and checking Bamboo's log files to see if a more detailed error message is being sent from GitHub. Bamboo's main log file can be found here on disk:
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