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docs: add all options available with env var (#598)

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* docs: add all options available with env var

* Update docs/options.md

Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>

* Update docs/options.md

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Co-authored-by: Kévin Dunglas <kevin@dunglas.fr>
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README.md
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@ -30,7 +30,7 @@ with [FrankenPHP](https://frankenphp.dev) and [Caddy](https://caddyserver.com/)
## Docs
1. [Build options](docs/build.md)
1. [Options available](docs/options.md)
2. [Using Symfony Docker with an existing project](docs/existing-project.md)
3. [Support for extra services](docs/extra-services.md)
4. [Deploying in production](docs/production.md)

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# Build Options
## Selecting a Specific Symfony Version
Use the `SYMFONY_VERSION` environment variable to select a specific Symfony version.
For instance, use the following command to install Symfony 6.4:
On Linux:
SYMFONY_VERSION=6.4.* docker compose up -d --wait
On Windows:
set SYMFONY_VERSION=6.4.* && docker compose up -d --wait&set SYMFONY_VERSION=
## Installing Development Versions of Symfony
To install a non-stable version of Symfony, use the `STABILITY` environment variable during the build.
The value must be [a valid Composer stability option](https://getcomposer.org/doc/04-schema.md#minimum-stability).
For instance, use the following command to use the development branch of Symfony:
On Linux:
STABILITY=dev docker compose up -d --wait
On Windows:
set STABILITY=dev && docker compose up -d --wait&set STABILITY=
## Customizing the Server Name
Use the `SERVER_NAME` environment variable to define your custom server name(s).
SERVER_NAME="app.localhost" docker compose up -d --wait
> [!TIP]
> You can define your server name variable in your `.env` file to keep it at each up
## Using custom HTTP ports
Use the environment variables `HTTP_PORT`, `HTTPS_PORT` and/or `HTTP3_PORT` to adjust the ports to your needs, e.g.
HTTP_PORT=8000 HTTPS_PORT=4443 HTTP3_PORT=4443 docker compose up -d --wait
to access your application on [https://localhost:4443](https://localhost:4443).
> [!NOTE]
> Let's Encrypt only supports the standard HTTP and HTTPS ports. Creating a Let's Encrypt certificate for another port will not work, you have to use the standard ports or to configure Caddy to use another provider.

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# Docker Build Options
You can customize the docker build process using these environment variables.
> [!NOTE]
> All Symfony-specific environment variables are used only if no `composer.json` file is found in the project directory.
## Selecting a Specific Symfony Version
Use the `SYMFONY_VERSION` environment variable to select a specific Symfony version.
For instance, use the following command to install Symfony 6.4:
On Linux:
SYMFONY_VERSION=6.4.* docker compose up -d --wait
On Windows:
set SYMFONY_VERSION=6.4.* && docker compose up -d --wait&set SYMFONY_VERSION=
## Installing Development Versions of Symfony
To install a non-stable version of Symfony, use the `STABILITY` environment variable during the build.
The value must be [a valid Composer stability option](https://getcomposer.org/doc/04-schema.md#minimum-stability).
For instance, use the following command to use the development branch of Symfony:
On Linux:
STABILITY=dev docker compose up -d --wait
On Windows:
set STABILITY=dev && docker compose up -d --wait&set STABILITY=
## Using custom HTTP ports
Use the environment variables `HTTP_PORT`, `HTTPS_PORT` and/or `HTTP3_PORT` to adjust the ports to your needs, e.g.
HTTP_PORT=8000 HTTPS_PORT=4443 HTTP3_PORT=4443 docker compose up -d --wait
to access your application on [https://localhost:4443](https://localhost:4443).
> [!NOTE]
> Let's Encrypt only supports the standard HTTP and HTTPS ports. Creating a Let's Encrypt certificate for another port will not work, you have to use the standard ports or to configure Caddy to use another provider.
## Caddyfile Options
You can also customize the `Caddyfile` by using the following environment variables to inject options block, directive or configuration.
> [!TIP]
> All the following environment variables can be defined in your `.env` file at the root of the project to keep them persistent at each startup
| Environment variable | Description | Default value |
|---------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------|
| `CADDY_GLOBAL_OPTIONS` | the [global options block](https://caddyserver.com/docs/caddyfile/options#global-options), one per line | |
| `CADDY_EXTRA_CONFIG` | the [snippet](https://caddyserver.com/docs/caddyfile/concepts#snippets) or the [named-routes](https://caddyserver.com/docs/caddyfile/concepts#named-routes) options block, one per line | |
| `CADDY_SERVER_EXTRA_DIRECTIVES` | the [`Caddyfile` directives](https://caddyserver.com/docs/caddyfile/concepts#directives) | |
| `SERVER_NAME` | the server name or address | `localhost` |
| `FRANKENPHP_CONFIG` | a list of extra [FrankenPHP directives](https://frankenphp.dev/docs/config/#caddyfile-config), one per line | `import worker.Caddyfile` |
| `MERCURE_TRANSPORT_URL` | the value passed to the `transport_url` directive | `bolt://mercure.db` |
| `MERCURE_PUBLISHER_JWT_KEY` | the JWT key to use for publishers | |
| `MERCURE_PUBLISHER_JWT_ALG` | the JWT algorithm to use for publishers | `HS256` |
| `MERCURE_SUBSCRIBER_JWT_KEY` | the JWT key to use for subscribers | |
| `MERCURE_SUBSCRIBER_JWT_ALG` | the JWT algorithm to use for subscribers | `HS256` |
| `MERCURE_EXTRA_DIRECTIVES` | a list of extra [Mercure directives](https://mercure.rocks/docs/hub/config), one per line | |
### Example of server name customize:
SERVER_NAME="app.localhost" docker compose up -d --wait