Allow retries for subprocess commands

[michael-sbarra-apexai]

#21

[kilian-funk]

@michael-sbarra-apexai What is the purpose of this change? If the timeout is too short, can you not simply increase the timeout instead of adding all of this complexity to the code?

[michael-sbarra-apexai]

@michael-sbarra-apexai What is the purpose of this change? If the timeout is too short, can you not simply increase the timeout instead of adding all of this complexity to the code?

@kilian-funk See #21. If some brief network interruption occurred, the whole file builder would be lost resulting in the error shown in the issue. I also found sometimes the git ... command would hang and not terminate, which is why I added the timeout. This now adds a max_retries = 3 with a timeout of 20s (for git clone), so the file build will not fail on some brief network issue. In additional testing, I found that timeout of 5s should be sufficient.