deploy-guide: document the seed container

[ideaship]

Summary

Documents the seed container (registry.osism.tech/osism/seed) in the deploy guide, which was previously undocumented — the guide only described installing packages on the seed node by hand.

• seed.md: presents the seed container as Option 1 (needs nothing but Docker/Podman on the seed node) and keeps the manual package installation as Option 2. Points to the maintained image location and notes that quay.io/osism/seed is no longer updated.
• manager.md: explains that run.sh automatically runs the playbooks inside the seed container when a container engine is present (SEED_CONTAINER=auto, the default), so every Manager step stays a plain ./run.sh <playbook>. Documents the two knobs a deployer actually chooses (SEED_CONTAINER, CONTAINER_ENGINE) plus SEED_CONTAINER_MOUNT_OPTS.

Related

• Seed container image this guide documents (per-release collection sets): Add multi-release seed container (runtime collection-set selection) container-images#935
• Manager run.sh SEED_CONTAINER path the guide describes: run.sh: run playbooks in the seed container generics#596

AI-assisted: Claude Code

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
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✅ JSON	jsonlint	4		0	0	0.08s
✅ JSON	prettier	4		0	0	0.39s
✅ JSON	v8r	4		0	0	8.78s
⚠️ MARKDOWN	markdownlint	160		4	0	2.41s
⚠️ MARKDOWN	markdown-table-formatter	160		1	0	0.45s
✅ REPOSITORY	checkov	yes		no	no	19.0s
✅ REPOSITORY	git_diff	yes		no	no	0.04s
✅ REPOSITORY	secretlint	yes		no	no	1.68s
✅ REPOSITORY	trufflehog	yes		no	no	4.52s
✅ SPELL	codespell	170		0	0	0.48s
⚠️ SPELL	lychee	170		2	0	29.4s
✅ YAML	prettier	6		0	0	0.45s
✅ YAML	v8r	6		0	0	6.48s
✅ YAML	yamllint	6		0	0	0.43s

Detailed Issues

⚠️ SPELL / lychee - 2 errors

📝 Summary
---------------------
🔍 Total..........922
🔗 Unique.........746
✅ Successful.....851
⏳ Timeouts.........8
🔀 Redirected......46
👻 Excluded........61
❓ Unknown..........0
🚫 Errors...........2
⛔ Unsupported......2

Errors in docs/appendix/security/ossa-2026-015.md
[TIMEOUT] https://bugs.launchpad.net/keystone/+bug/2148398 (at 174:3) | Request timed out
[TIMEOUT] https://bugs.launchpad.net/keystone/+bug/2150379 (at 179:3) | Request timed out

Errors in docs/cloud-in-a-box/index.md
[TIMEOUT] https://www.wireguard.com/ (at 209:41) | Request timed out

Errors in docs/guides/configuration-guide/openstack/cinder.md
[ERROR] https://docs.openstack.org/cinder/latest/admin/index.html (at 7:3) | Connection closed before response completed

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

Errors in docs/release-notes/osism-8.md
[TIMEOUT] https://www.openstack.org/software/openstack-caracal (at 222:38) | Request timed out

Errors in docs/release-notes/osism-9.md
[TIMEOUT] https://bugs.launchpad.net/kolla/+bug/2111620 (at 96:47) | Request timed out

Errors in docs/testbed/prerequisites.mdx
[TIMEOUT] https://wireguard.com/ (at 70:3) | Request timed out

Errors in docs/testbed/usage.mdx
[TIMEOUT] https://www.wireguard.com/ (at 27:9) | Request timed out

Hint: Followed 46 redirects. You might want to consider replacing redirecting URLs with the resolved URLs. Use verbose mode (`-v`/`-vv`) to see redirection details.

⚠️ MARKDOWN / markdown-table-formatter - 1 error

1 files contain markdown tables to format:
- docs/guides/developer-guide/retiring-openstack-releases.md

⚠️ MARKDOWN / markdownlint - 4 errors

docs/guides/developer-guide/retiring-openstack-releases.md:181:450 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
docs/guides/developer-guide/retiring-openstack-releases.md:181:535 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
docs/guides/developer-guide/retiring-openstack-releases.md:183:417 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
docs/guides/developer-guide/retiring-openstack-releases.md:183:502 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]

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[jklare]

LGTM, but we should merge the direct dependencies on the script refactoring first i guess.