[docs] Add Aspire.Hosting.EntityFrameworkCore hosting integration documentation

[aspire-repo-bot]

Documents changes from microsoft/aspire#13481 — @Copilot

Targeting release/13.3 based on the source PR milestone 13.3 (which exists on microsoft/aspire.dev).

Why this PR is needed

microsoft/aspire#13481 introduces the Aspire.Hosting.EntityFrameworkCore NuGet package — a new AppHost hosting integration that manages EF Core database migrations. This is a significant new user-facing feature with no existing documentation on aspire.dev. The existing Apply EF Core migrations page covers only the manual migration worker service approach; it does not mention the new hosting integration.

What was added

New page: src/frontend/src/content/docs/integrations/databases/efcore/ef-migrations-hosting.mdx

Covers:

• Installing Aspire.Hosting.EntityFrameworkCore in the AppHost
• AddEFMigrations() — generic and string-based overloads, multiple DbContext types
• RunDatabaseUpdateOnStart() — automatic migrations at startup with health check integration
• WaitFor(migrations) — blocking dependent resources until migrations complete
• PublishAsMigrationScript() and PublishAsMigrationBundle() — publish-time artifact generation
• WithMigrationOutputDirectory and WithMigrationNamespace — customization options
• WithMigrationsProject<T>() — separate migrations project support
• Dashboard resource commands reference table (Update Database, Drop Database, Reset Database, Add Migration, Remove Migration, Get Database Status)

Sidebar update: src/frontend/config/sidebar/integrations.topics.ts

Added EF migrations hosting integration entry under the Entity Framework Core group, immediately after the existing Apply migrations entry.

Files modified

• src/frontend/src/content/docs/integrations/databases/efcore/ef-migrations-hosting.mdx (new)
• src/frontend/config/sidebar/integrations.topics.ts (updated)

This draft PR needs human review before merging, particularly to verify code examples against the final shipped API surface.

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[AndriySvyryd]

Most of this is already documented in https://github.com/microsoft/aspire.dev/pull/774/changes#diff-a35f8bf3a9b68b09c860816e9fd63d18e4c7eac0276c8da94f8debd31448d505
This should at least use the existing page

[Copilot]

You're right — the AddEFMigrations content already exists in migrations.mdx from PR #774. I've removed the duplicate ef-migrations-hosting.mdx page and its sidebar entry in commit 58637b4. The PR now has no net changes vs. the base branch.

[IEvangelist]

Hey @copilot, please update this PR. It looks like this is perhaps a duplicate of an existing doc that already came through for these changes. Have a look at src/frontend/src/content/docs/integrations/databases/efcore/migrations.mdx and reconcile this, either de-dup, or close this PR.

[Copilot]

Hey @copilot, please update this PR. It looks like this is perhaps a duplicate of an existing doc that already came through for these changes. Have a look at src/frontend/src/content/docs/integrations...

Done — I've removed the duplicate ef-migrations-hosting.mdx file and its sidebar entry (commit 58637b4). The AddEFMigrations content was already covered in migrations.mdx from PR #774, so this PR is now empty and can be closed.