fix: add support for disk-based deployment mode for Debian 11

[ukushisanet]

Summary of Pull Request

Debian 11 was introduced to the project in the v22.08 release with only support for HTTP-based deployment only.

This PR will add the enhancement for disk-based deployment support and fix issue #261 as discussed with @tenthirtyam in comments.

Type of Pull Request

• This is a bugfix. type/bug
• This is an enhancement or feature. type/feature or type/enhancement
• This is a documentation update. type/docs
• This is a refactoring update. type/refactor
• This is a chore. type/chore
• This is something else.
  Please describe:

Related to Existing Issues

• Resolves Add support for disk-based deployment mode for Debian 11 #261

Test and Documentation Coverage

• Tests have been completed.
• Documentation has been added or updated.

The boot_command and the preseed/early_command are determined based on the configuration in the common_data_source variable.

Here is the output of the whole boot sequence with the common_data_source variable set to disk:

And here is a screenshot of the boot command with the common_data_source variable set to http:

Breaking Changes?

• Yes, there are breaking changes.
• No, there are no breaking changes.

[tenthirtyam]

Many thanks for the contribution and the very detailed pull request, it is much appreciated. I'll review this week and merge if all is a go.

Thank you for being a contributor, I hope you have found the project helpful.

Ryan Johnson
Senior Staff Solutions Architect | Product Engineering @ VMware, Inc.

[tenthirtyam]

Verified in testbed - LGTM! 🚀

[github-actions]

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