Docs: Add osbuild to documentation

[angelcerveraroldan]

• Add osbuild to the list of main commands, and remove buildextend commands.
• Add cosa osbuild qemu as a step in the build docs.

Closes: #4304

[gemini-code-assist]

Code Review

This pull request updates the documentation to reflect the introduction of the osbuild command for creating images, replacing the older buildextend commands. The changes in docs/cosa.md correctly add osbuild and remove buildextend. In docs/building-fcos.md, the build process is updated to use cosa osbuild qemu. However, I've noted one issue where the cosa fetch command is removed, which will cause an error for new users. My review includes a comment to address this.

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docs/building-fcos.md (188-195)

This change removes the explicit cosa fetch step. However, cosa build will fail on a fresh checkout if cosa fetch has not been run first, leading to a "Must fetch before building" error. This will break the workflow for new users following this guide. Please consider keeping this section, or at least mentioning that cosa fetch is a prerequisite to cosa build.

[dustymabe]

/test ci/prow/rhcos

[openshift-ci]

@dustymabe: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

/test images

/test rhcos

Details

In response to this:

/test ci/prow/rhcos

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[dustymabe]

LGTM

[dustymabe]

/test rhcos

[dustymabe]

NOTE: I'm running the rhcos test not because I suspect this change needs to be tested, but for another unrelated change where I want to see if CI is fixed now

[dustymabe]

hmm. I think I'd prefer for the 4 commits to be combined into one with maybe each current commit title as a bullet point in the body of the commit.

[openshift-ci]

@angelcerveraroldan: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/rhcos	b799ac0	link	true	/test rhcos

Full PR test history. Your PR dashboard.

Details

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[jbtrystram]

Agreed with Dusty, this should be one commit

[jbtrystram]

Thanks ! Some small suggestions