Add more support for Azure DevOps

[JamieMagee]

Adds the following features:

• Ability to pass an --api-url flag which gets passed through as the DEPENDABOT_API_URL environment variable for the updater container
  • Still falls back to http://host.docker.internal if one isn't provided
• Adds credentials for the API URL, Azure DevOps, and Azure Artifacts from the LOCAL_AZURE_ACCESS_TOKEN environment variable
• Passes through the DEPENDABOT_JOB_ID environment variable to the updater container
  • Still falls back to the cli job ID if the environment isn't set
• A new struct and parsing logic for Azure DevOps repository format

TODO:

• Additional support for setting input and job parameters from environment variables
  • Will handle this in a separate PR

[JamieMagee]

Finished porting the code changes, but still need to fix some tests.

one sec checking something

[jakecoffman]

(We need to add some better command line testing around the positional arguments.)

This doesn't work with this PR: dependabot update go_modules dependabot/cli

updater | 2023/12/20 21:48:12 ERROR Error during file fetching; aborting: Cloning into '/home/dependabot/dependabot-updater/repo'...
updater | warning: Could not find remote branch --single-branch to clone.
updater | fatal: Remote branch --single-branch not found in upstream origin

I would guess it's because we're now setting the branch to an empty string and the Updater thinks an empty string branch name is ok.

To fix it, I would change the Source struct to not have a pointer to Branch anymore, like Commit.

[JamieMagee]

Thanks for the sanity check. I made Branch a value instead of a pointer.

[jakecoffman]

Nice work 👍