Migrate [Discord] implementation to use bot token (#5346)

* Migrate [Discord] implementation to use bot token

* Rework authorization field creation

* Revert "Rework authorization field creation"

This reverts commit caf65bde5d.

* Add LGTM exclusion for hardcoded credentials

config/custom-environment-variables.yml

@@ -64,8 +64,6 @@ public:
 
   fetchLimit: 'FETCH_LIMIT'
 
-  shieldsProductionHerokuHacks: 'SHIELDS_PRODUCTION_HEROKU_HACKS'
-
 private:
   azure_devops_token: 'AZURE_DEVOPS_TOKEN'
   bintray_user: 'BINTRAY_USER'
@@ -74,6 +72,7 @@ private:
   bitbucket_password: 'BITBUCKET_PASS'
   bitbucket_server_username: 'BITBUCKET_SERVER_USER'
   bitbucket_server_password: 'BITBUCKET_SERVER_PASS'
+  discord_bot_token: 'DISCORD_BOT_TOKEN'
   drone_token: 'DRONE_TOKEN'
   gh_client_id: 'GH_CLIENT_ID'
   gh_client_secret: 'GH_CLIENT_SECRET'

config/default.yml

@@ -36,6 +36,4 @@ public:
 
   fetchLimit: '10MB'
 
-  shieldsProductionHerokuHacks: false
-
 private: {}

config/local-shields-io-production.template.yml

@@ -1,5 +1,6 @@
 private:
   # These are the keys which are set on the production servers.
+  discord_bot_token: ...
   gh_client_id: ...
   gh_client_secret: ...
   redis_url: ...