Possiblity to autoinstall in Docker Compose (#3353)

* Possiblity to autoinstall in Docker Compose

#fix https://github.com/FreshRSS/FreshRSS/issues/3349

It is simply calling our existing CLI: do-install.php and
create-user.php
https://github.com/FreshRSS/FreshRSS/tree/master/cli

FreshRSS will typically be ready a few seconds before the database, so
introduce a tolerance when the database is not available / up (yet) by
trying a few times to connect. Also useful to avoid service interruption
when DB service is restarted.

Example:

```yml
freshrss-app:
    image: freshrss/freshrss
    container_name:
freshrss-app
    hostname: freshrss-app
    restart: unless-stopped

ports:
      - "8080:80"
    depends_on:
      - freshrss-db

volumes:
      - data:/var/www/FreshRSS/data
      -
extensions:/var/www/FreshRSS/extensions
    environment:
      CRON_MIN:
'*/20'
      FRESHRSS_ENV: development
      FRESHRSS_INSTALL: |-

--api_enabled
        --base_url https://rss.example.net

--db-base freshrss
        --db-host freshrss-db
        --db-password
freshrss
        --db-type pgsql
        --db-user freshrss

--default_user admin
        --language en
      FRESHRSS_USER: |-

--api_password freshrss
        --email user@example.net

--language en
        --password freshrss
        --user admin
      TZ:
Europe/Paris
```

* Minor type f in find

* shellcheck

1 files changed, 2 insertions, 2 deletions

diff --git a/cli/do-install.php b/cli/do-install.php
index fd51003ab..258b5b688 100755
--- a/cli/do-install.php
+++ b/cli/do-install.php
@@ -3,7 +3,7 @@
 require(__DIR__ . '/_cli.php');
 
 if (!file_exists(DATA_PATH . '/do-install.txt')) {
-	fail('FreshRSS seems to be already installed! Please use `./cli/reconfigure.php` instead.');
+	fail('FreshRSS seems to be already installed!' . "\n" . 'Please use `./cli/reconfigure.php` instead.', EXIT_CODE_ALREADY_EXISTS);
 }
 
 $params = array(
@@ -107,7 +107,7 @@ if (!$ok) {
 	fail('FreshRSS database error: ' . (empty($_SESSION['bd_error']) ? 'Unknown error' : $_SESSION['bd_error']));
 }
 
-echo '• Remember to create the default user: ', $config['default_user'] , "\n",
+echo 'ℹ️ Remember to create the default user: ', $config['default_user'],
 	"\t", './cli/create-user.php --user ', $config['default_user'], " --password 'password' --more-options\n";
 
 accessRights();