fix(deploy): add runtime admin authentication fallback

[tonicofonico]

Description

Add a Docker-runtime option for using browser-side authentication instead of the Admin frontend's authentication Server Actions:

APPFLOWY_ADMIN_DISABLE_SERVER_ACTIONS=false

The option is documented in deploy.env and passed to admin_frontend by Docker Compose. It remains disabled by default.

Problem

Behind some TLS-terminating reverse proxies, Server Action requests can lose the expected cookie or origin context and cause an authentication redirect loop.

The original version of this PR used NEXT_PUBLIC_DISABLE_SERVER_ACTIONS. That name is a build-time Next.js setting, so setting it when starting the prebuilt Admin image does not update the browser bundle.

Runtime behavior

This PR is paired with AppFlowy-Admin #67, which injects APPFLOWY_ADMIN_DISABLE_SERVER_ACTIONS into window.__APP_CONFIG__:

• unset or false: continue using authentication Server Actions
• true: use the existing browser-side authentication API fallback

This setting only changes Admin authentication behavior; it does not globally disable Next.js Server Actions.

Dependency

AppFlowy-Admin #67 must be merged and a compatible appflowyinc/admin_frontend image must be published before this PR is ready to merge.

Verification

• docker compose --env-file deploy.env config --quiet
• verified Compose renders the default as false and an explicit override as true
• built the Admin image from feat: returns if user is new for both oauth and password login #67 and started it through this Compose service definition
• verified the container receives APPFLOWY_ADMIN_DISABLE_SERVER_ACTIONS=true
• verified /console/login exposes the runtime value to browser code

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR adds a configurable NEXT_PUBLIC_DISABLE_SERVER_ACTIONS environment variable to the admin_frontend Docker Compose deployment and documents it in the deploy.env template to support disabling Next.js Server Actions in certain reverse-proxy setups.

File-Level Changes

Change	Details	Files
Make NEXT_PUBLIC_DISABLE_SERVER_ACTIONS configurable for the admin_frontend service in Docker Compose.	Add NEXT_PUBLIC_DISABLE_SERVER_ACTIONS to the admin_frontend service environment block. Default the variable to false when not explicitly set via NEXT_PUBLIC_DISABLE_SERVER_ACTIONS:-false expansion.	docker-compose.yml
Document the NEXT_PUBLIC_DISABLE_SERVER_ACTIONS environment variable in the deployment env template.	Add a new NEXT_PUBLIC_DISABLE_SERVER_ACTIONS entry to deploy.env. Provide inline documentation or comments explaining its purpose and typical usage.	deploy.env

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[CLAassistant]

All committers have signed the CLA.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[appflowy]

Maintainer follow-up: I pushed 581c77d5 to replace the ineffective runtime NEXT_PUBLIC_DISABLE_SERVER_ACTIONS setting with APPFLOWY_ADMIN_DISABLE_SERVER_ACTIONS. The original NEXT_PUBLIC_* value is frozen when the Admin image is built and was not visible to browser code when set by Compose.