Add outbound sync worker runtime

config/config.exs

@@ -10,7 +10,8 @@ config :parrhesia,
     private_key: nil
   ],
   sync: [
-    path: nil
+    path: nil,
+    start_workers?: true
   ],
   limits: [
     max_frame_bytes: 1_048_576,

config/runtime.exs

@@ -456,7 +456,12 @@ if config_env() == :prod do
       private_key: string_env.("PARRHESIA_IDENTITY_PRIVATE_KEY", nil)
     ],
     sync: [
-      path: string_env.("PARRHESIA_SYNC_PATH", nil)
+      path: string_env.("PARRHESIA_SYNC_PATH", nil),
+      start_workers?:
+        bool_env.(
+          "PARRHESIA_SYNC_START_WORKERS",
+          Keyword.get(Application.get_env(:parrhesia, :sync, []), :start_workers?, true)
+        )
     ],
     moderation_cache_enabled:
       bool_env.("PARRHESIA_MODERATION_CACHE_ENABLED", moderation_cache_enabled_default),

config/test.exs

@@ -20,7 +20,8 @@ config :parrhesia,
     private_key: nil
   ],
   sync: [
-    path: Path.join(System.tmp_dir!(), "parrhesia_test_sync.json")
+    path: Path.join(System.tmp_dir!(), "parrhesia_test_sync.json"),
+    start_workers?: false
   ],
   features: [verify_event_signatures: false]