Add screenshots to the dev containers user guide:
- Running dev containers with sub-agents (index.md, working-with-dev-containers.md)
- Discovered dev containers with Start button (index.md)
- Outdated status with rebuild option (working-with-dev-containers.md)
- Display apps disabled (customizing-dev-containers.md)
Also deletes the outdated devcontainer-agent-ports.png.
Refs #21157
Dev container admin docs were scattered across two locations: the Docker-based
integration under extending-templates/ and Envbuilder under managing-templates/.
There was no landing page explaining that two approaches exist or helping admins
choose between them.
This moves everything under admin/integrations/devcontainers/ with a decision
guide at the top. Dev containers are an integration with the dev container
specification, so integrations/ is a natural fit alongside JFrog, Vault, etc.
Stub pages remain at the original locations for discoverability.
New structure:
admin/integrations/devcontainers/
├── index.md # Landing page + decision guide
├── integration.md # Docker-based dev containers
└── envbuilder/
├── index.md
├── add-envbuilder.md
├── envbuilder-security-caching.md
└── envbuilder-releases-known-issues.md
Refs #21080
docs: rewrite dev containers documentation for GA
Corrects inaccuracies in SSH examples (deprecated `--container` flag),
port forwarding (native sub-agent forwarding is primary), and
prerequisites (dev containers are on by default). Fixes template
descriptions: docker-devcontainer uses native Dev Containers while
AWS/Kubernetes templates use Envbuilder.
Renames admin docs folder from `devcontainers/` to `envbuilder/` to
reflect actual content. Adds customization guide documenting agent
naming, display apps, custom apps, and variable interpolation. Documents
multi-repo workspace support and adds note about Terraform module
limitations with sub-agents. Fixes module registry URLs.
Refs #18907
Danielle Maywood