Implemented rolling release support:

- Now basing on image 'kdelfour/supervisor-docker'
    - Cron script will check and update TT-RSS and all plugins on a daily basis automatically
    - SSL/TLS encryption is off by default so that TT-RSS is running on port 80 by default now
    - SSL/TLS can be enabled with setting "-e TTRSS_SSL_ENABLED=1"
    - A lot of cleanups

ttrss-utils.php

@@ -0,0 +1,45 @@
+<?php
+
+function env($name, $default = null)
+{
+    $v = getenv($name) ?: $default;
+
+    if ($v === null) {
+        error('The env ' . $name . ' does not exist');
+    }
+
+    return $v;
+}
+
+function error($text)
+{
+    echo 'Error: ' . $text . PHP_EOL;
+    exit(1);
+}
+
+function dbconnect($config)
+{
+    $map = array('host' => 'HOST', 'port' => 'PORT', 'dbname' => 'NAME', 'user' => 'USER', 'password' => 'PASS');
+    $dsn = $config['DB_TYPE'] . ':';
+    foreach ($map as $d => $h) {
+        if (isset($config['DB_' . $h])) {
+            $dsn .= $d . '=' . $config['DB_' . $h] . ';';
+        }
+    }
+    $pdo = new \PDO($dsn);
+    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+    return $pdo;
+}
+
+function dbcheck($config)
+{
+    try {
+        dbconnect($config);
+        return true;
+    }
+    catch (PDOException $e) {
+        return false;
+    }
+}
+
+?>