Mark SSO login as removed

[kunalmohan-work]

• Have you updated CHANGELOG.md with relevant non-documentation file changes?
• Have you updated the documentation for this change?

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[Copilot]

Pull request overview

This PR updates the Livepatch Server documentation to reflect that Ubuntu SSO authentication for admin access has been removed, and to steer users toward Basic Auth/password authentication instead.

Changes:

• Updates the platform configuration reference to state Ubuntu SSO is removed and adds a “removed” subsection for SSO keys.
• Updates the administration tool auth guide to mark Ubuntu SSO as removed and adds a note about using password auth instead.
• Updates reactive→operator migration docs to label auth.sso.* mappings as removed and add guidance for removing SSO keys during migration.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
docs/server/reference/platform/configuration.md	Marks Ubuntu SSO as removed and adds an explicit removed subsection for SSO config keys.
docs/server/how-to-guides/security/setup-administration-tool.md	Marks Ubuntu SSO login as removed in the admin tool setup guide.
docs/server/how-to-guides/deployment/migrate-from-reactive-charm-to-operator-charm.md	Updates migration mapping table entries to indicate SSO-related keys are removed.
docs/server/how-to-guides/deployment/migrate-from-reactive-charm-to-k8s-operator-charm.md	Adds a note warning that migrated configs may include removed auth.sso.* keys.

Comments suppressed due to low confidence (1)

docs/server/reference/platform/configuration.md:91

• Although this subsection is marked as removed, the option descriptions still read as if Ubuntu SSO can be enabled/configured. To avoid confusion, update the table row descriptions to explicitly state these keys are removed/unsupported.

| `auth.sso.enabled` | Enable Ubuntu SSO authentication. | `bool` |
| `auth.sso.teams` | SSO authentication configuration listing authorised teams. | `https://launchpad.net/~team-1,https://launchpad.net/~team-2` |
| `auth.sso.url` | URL for SSO authentication. | `login.ubuntu.com` |
| `auth.sso.public-key` | Public key for the authentication server. Accepts a file path or an inline key. | `string` |

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

docs/server/reference/platform/configuration.md:90

• The Ubuntu SSO section is marked as removed, but the config table rows still read as if SSO can be enabled/configured. This is likely to confuse readers; update the descriptions to clearly indicate the keys are removed/ignored (or remove the table entirely if it’s no longer applicable).

| ---- | ----------- | ------ |
| `auth.sso.enabled` | Enable Ubuntu SSO authentication. | `bool` |
| `auth.sso.teams` | SSO authentication configuration listing authorised teams. | `https://launchpad.net/~team-1,https://launchpad.net/~team-2` |
| `auth.sso.url` | URL for SSO authentication. | `login.ubuntu.com` |
| `auth.sso.public-key` | Public key for the authentication server. Accepts a file path or an inline key. | `string` |

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

docs/server/reference/platform/configuration.md:90

• The auth.sso.* rows still read as if Ubuntu SSO can be enabled/configured (e.g., "Enable Ubuntu SSO authentication"), which conflicts with the surrounding "removed" messaging. Update the row descriptions to clearly state these keys are removed/ignored.

| `auth.sso.enabled` | Enable Ubuntu SSO authentication. | `bool` |
| `auth.sso.teams` | SSO authentication configuration listing authorised teams. | `https://launchpad.net/~team-1,https://launchpad.net/~team-2` |
| `auth.sso.url` | URL for SSO authentication. | `login.ubuntu.com` |
| `auth.sso.public-key` | Public key for the authentication server. Accepts a file path or an inline key. | `string` |

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

docs/server/reference/platform/configuration.md:90

• The Ubuntu SSO section says these keys are removed/ignored, but the per-key descriptions still read as if enabling/configuring SSO is supported. This can mislead readers into thinking these options still work; update the table descriptions to explicitly mark them as removed/ignored.

| ---- | ----------- | ------ |
| `auth.sso.enabled` | Enable Ubuntu SSO authentication. | `bool` |
| `auth.sso.teams` | SSO authentication configuration listing authorised teams. | `https://launchpad.net/~team-1,https://launchpad.net/~team-2` |
| `auth.sso.url` | URL for SSO authentication. | `login.ubuntu.com` |
| `auth.sso.public-key` | Public key for the authentication server. Accepts a file path or an inline key. | `string` |

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (1)

docs/server/reference/platform/configuration.md:90

• This section says auth.sso.* keys are retained for legacy reference and ignored by the server, but the table row descriptions below still read as if Ubuntu SSO can be enabled/configured. Updating the row descriptions will avoid confusing readers into thinking these keys have effect.

| `auth.sso.enabled` | Enable Ubuntu SSO authentication. | `bool` |
| `auth.sso.teams` | SSO authentication configuration listing authorised teams. | `https://launchpad.net/~team-1,https://launchpad.net/~team-2` |
| `auth.sso.url` | URL for SSO authentication. | `login.ubuntu.com` |
| `auth.sso.public-key` | Public key for the authentication server. Accepts a file path or an inline key. | `string` |