Implemented WebHooks delivery queue.

Completely removed usage of the RabbitMQ. Queue now based on Redis channels.
Worker process now extracted as separate docker container.
Base image upgraded to the 1.8.0 version (PHP 7.2.7 and pcntl extension).

common/components/Redis/Key.php

@@ -16,43 +16,35 @@ class Key {
         $this->key = $this->buildKey($key);
     }
 
-    public function getRedis(): Connection {
-        return Yii::$app->redis;
-    }
-
     public function getKey(): string {
         return $this->key;
     }
 
     public function getValue() {
-        return $this->getRedis()->get($this->key);
+        return Yii::$app->redis->get($this->key);
     }
 
     public function setValue($value): self {
-        $this->getRedis()->set($this->key, $value);
-
+        Yii::$app->redis->set($this->key, $value);
         return $this;
     }
 
     public function delete(): self {
-        $this->getRedis()->del([$this->getKey()]);
-
+        Yii::$app->redis->del($this->getKey());
         return $this;
     }
 
     public function exists(): bool {
-        return (bool)$this->getRedis()->exists($this->key);
+        return (bool)Yii::$app->redis->exists($this->key);
     }
 
     public function expire(int $ttl): self {
-        $this->getRedis()->expire($this->key, $ttl);
-
+        Yii::$app->redis->expire($this->key, $ttl);
         return $this;
     }
 
     public function expireAt(int $unixTimestamp): self {
-        $this->getRedis()->expireat($this->key, $unixTimestamp);
-
+        Yii::$app->redis->expireat($this->key, $unixTimestamp);
         return $this;
     }