LU06b - Checkout pipeline with private repository

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1. I can set up a private repo (i.e. on GitHub).
2. I can set up a Jenkins pipeline stage for checkout code from a private repo.
3. If there are any errors, I can analyze the error, suggest and test an initial workaround (troubleshooting).

1. Setup Jenkins 06/02_Exercises/a01 - according to the learning objectives (see course repository).
2. If there is an error, read the message carefully, think about a solution and implement it.

Daniel Garavaldi