image-manager: document preview-by-default

[jklare]

What

Document that the OpenStack Image Manager now previews by default and requires --upload to actually import images, following osism/openstack-image-manager#1251.

• Getting started guide: explain the preview-by-default behaviour and add an --upload variant of the run command.
• Cloud in a Box image import example: add --upload and a note about the preview behaviour.
• Both docs add a note that preview by default is only available from a certain OSISM release onwards.

Open items

• Fill in the <RELEASE> placeholder in both files with the concrete OSISM release once the change ships.

Depends on

This is kept as a draft because it depends on osism/openstack-image-manager#1251, which must merge (and be released) first. The osism manage images wrapper behaves the same way and also requires --upload.

🤖 Generated with Claude Code

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	5		0	0	0.05s
✅ JSON	jsonlint	4		0	0	0.11s
✅ JSON	prettier	4		0	0	0.44s
✅ JSON	v8r	4		0	0	8.43s
✅ MARKDOWN	markdownlint	156		0	0	2.38s
✅ MARKDOWN	markdown-table-formatter	156		0	0	0.41s
✅ REPOSITORY	betterleaks	yes		no	no	0.75s
✅ REPOSITORY	checkov	yes		no	no	20.09s
✅ REPOSITORY	git_diff	yes		no	no	0.06s
✅ REPOSITORY	secretlint	yes		no	no	1.77s
✅ REPOSITORY	trufflehog	yes		no	no	4.48s
✅ SPELL	codespell	166		0	0	0.66s
⚠️ SPELL	lychee	166		1	0	29.16s
✅ YAML	prettier	6		0	0	0.48s
✅ YAML	v8r	6		0	0	6.91s
✅ YAML	yamllint	6		0	0	0.59s

Detailed Issues

⚠️ SPELL / lychee - 1 error

📝 Summary
---------------------
🔍 Total..........879
🔗 Unique.........719
✅ Successful.....815
⏳ Timeouts.........2
🔀 Redirected......49
👻 Excluded........61
❓ Unknown..........0
🚫 Errors...........1
⛔ Unsupported......1

Errors in docs/guides/deploy-guide/services/openstack.md
[TIMEOUT] https://www.openstack.org/software/project-navigator/openstack-components#openstack-services (at 14:5) | Request timed out

Errors in docs/release-notes/index.md
[ERROR] https://release.osism.tech/ (at 11:1) | Connection failed. Check network connectivity and firewall settings

Errors in docs/release-notes/osism-7.md
[TIMEOUT] https://www.openstack.org/software/openstack-bobcat (at 977:38) | Request timed out

Hint: Followed 49 redirects. You might want to consider replacing redirecting URLs with the resolved URLs. Use verbose mode (`-v`/`-vv`) to see redirection details.

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