For the observed error, try suggestions below and on this SO post:

• Double-checking incorrect module or package name:

  • module exist, not mispelled, case sensitive, present in the specified path

• Installing missing dependencies

• Missing init.py:

  • Creating the file _init_.py is recommended because the existence of an init.py file allows users to import the directory as a regular package, even if (as is the case in this tutorial) init.py is empty. Details here.

As an alternative, create a folder (shared_config) under repo_master containing the config.py file (+ init.py) and installing it as a dependency (via requirements.txt > pip install -r requirements.txt).

repo_master

├── shared_config

│ ├── _init_.py

│ └── config.py

├── repo_a

│ └── cloud_function_a

│ ├── main.py

│ ├── requirements.txt

│ └── .github/workflows/deploy.yml