Updated custom Containerfile to solve custom app download issue

[malay-gondalia]

Updated custom Containerfile to solve custom app download issue as there was error downloading custom apps from user git

Please provide enough information so that others can review your pull request:
was unable to download apps from my git repo. added code to loop through app variable to download.

Explain the details for making this change. What existing problem does the pull request solve?

added code to download apps from user git if not found.

[revant]

If you pass the PAT or credentials properly in apps.json it should work.

For your custom case you can always use your fork.

I managed to render apps.json with pat/creds using jinja and env var. If that is passed and is correct the it should work.

Try correct apps.json and try bench init manually on devcontainer

[github-actions]

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