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, 7 insertions, 4 deletions

diff --git a/cli/_cli.php b/cli/_cli.php
index dc7ee9d64..38eb55990 100644
--- a/cli/_cli.php
+++ b/cli/_cli.php
@@ -3,6 +3,7 @@ if (php_sapi_name() !== 'cli') {
 	die('FreshRSS error: This PHP script may only be invoked from command line!');
 }
 
+const EXIT_CODE_ALREADY_EXISTS = 3;
 const REGEX_INPUT_OPTIONS = '/^--/';
 const REGEX_PARAM_OPTIONS = '/:*$/';
 
@@ -16,9 +17,9 @@ Minz_Translate::init('en');
 
 FreshRSS_Context::$isCli = true;
 
-function fail($message) {
+function fail($message, $exitCode=1) {
 	fwrite(STDERR, $message . "\n");
-	die(1);
+	die($exitCode);
 }
 
 function cliInitUser($username) {
@@ -39,12 +40,14 @@ function cliInitUser($username) {
 }
 
 function accessRights() {
-	echo '• Remember to re-apply the appropriate access rights, such as:' , "\n",
+	echo 'ℹ️ Remember to re-apply the appropriate access rights, such as:',
 		"\t", 'sudo chown -R :www-data . && sudo chmod -R g+r . && sudo chmod -R g+w ./data/', "\n";
 }
 
 function done($ok = true) {
-	fwrite(STDERR, 'Result: ' . ($ok ? 'success' : 'fail') . "\n");
+	if (!$ok) {
+		fwrite(STDERR, (empty($_SERVER['argv'][0]) ? 'Process' : basename($_SERVER['argv'][0])) . ' failed!' . "\n");
+	}
 	exit($ok ? 0 : 1);
 }