Add imageService 'custom' to cloudflare integration

[FlorianFlatscher]

Changes

• Added a new imageService option to cloudflare integraion: custom
• Closes: #228

Testing

No Tests

Docs

• https://github.com/withastro/docs/pull/7813

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: b95e9fa5e39be81d02c248de043dae78dfca8778

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

| Name | Type | | ------------------------------------------------ | ----- | | @astrojs/cloudflare | Minor | | @test/astro-cloudflare-astro-dev-platform | Patch | | @test/astro-cloudflare-external-image-service | Patch | | @test/astro-cloudflare-no-output | Patch | | @test/astro-cloudflare-routes-json | Patch | | @test/astro-cloudflare-wasm | Patch | | @test/astro-cloudflare-with-solid-js | Patch | | @test/astro-cloudflare-wrangler-preview-platform | Patch |

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[FlorianFlatscher]

Thank you for your awesome guidance on my first contribution!

• I created and linked a docs pr
• Also updated adapter options
• changeset