Astro adapter

[Yuangwang]

Adds support for Astro in Firebase App Hosting.

To use follow these instructions:

1. Install the @apphosting/astro-adapter Astro adapter with the following command in your terminal:
   npx astro add @apphosting/astro-adapter
2. Add the adapter with the standalone rendering mode to your astro.config.* file:

import { defineConfig } from 'astro/config';
import node from '@apphosting/astro-adapter';

export default defineConfig({
  output: 'server',
  adapter: node({
    mode: 'standalone',
  }),
});

3. Push the changes to github and kickoff a new rollout

[schmetti-dev]

local images are not showing up. Is there something i need to change to get it working or is this a bug?

[jhuleatt]

This path needs to respect the outDir option in astro.config. I think that can be done with the { dir } argument that is passed into this astro:build:done callback

[jhuleatt]

Suggested change

	await fs.mkdir("./.apphosting");
	await fs.mkdir("./.apphosting", {
	// Don't throw if directory already exists. Important when debugging the build locally
	recursive: true
	});

https://nodejs.org/dist/latest-v16.x/docs/api/fs.html#fsmkdirpath-options-callback:~:text=.%20Calling%20fs.mkdir()%20when%20path%20is%20a%20directory%20that%20exists%20results%20in%20an%20error%20only%20when%20recursive%20is%20false