Add option to set HMAC key

src/invidious.cr

@@ -25,7 +25,7 @@ require "yaml"
 require "./invidious/*"
 
 CONFIG   = Config.from_yaml(File.read("config/config.yml"))
-HMAC_KEY = Random::Secure.random_bytes(32)
+HMAC_KEY = CONFIG.hmac_key || Random::Secure.random_bytes(32)
 
 crawl_threads = CONFIG.crawl_threads
 channel_threads = CONFIG.channel_threads

src/invidious/helpers.cr

@@ -43,6 +43,7 @@ class Config
     ),
     dl_api_key: String?,
     https_only: Bool?,
+    hmac_key:   String?,
   })
 end