Fix: intervals may not always be started in an async block.

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### 2.1.1 (Next)
 
+* [#172](https://github.com/slack-ruby/slack-ruby-bot-server/pull/172): Fix: intervals may not always be started in an async block - [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 ### 2.1.0 (2023/03/06)

lib/slack-ruby-bot-server/service.rb

@@ -79,11 +79,13 @@ def start_from_database!
     end
 
     def start_intervals!
-      @intervals.each_pair do |period, calls_with_options|
-        calls_with_options.each do |call_with_options|
-          call, options = *call_with_options
-          _every period, options do
-            call.call
+      ::Async::Reactor.run do
+        @intervals.each_pair do |period, calls_with_options|
+          calls_with_options.each do |call_with_options|
+            call, options = *call_with_options
+            _every period, options do
+              call.call
+            end
           end
         end
       end