A few fixes comming from Dialyser

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Fixes

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon/actors/actor.ex

@@ -213,7 +213,7 @@ defmodule Mobilizon.Actors.Actor do
   @doc """
   Get a public key for a given ActivityPub actor ID (url)
   """
-  @spec get_public_key_for_url(String.t()) :: {:ok, String.t()}
+  @spec get_public_key_for_url(String.t()) :: {:ok, String.t()} | {:error, atom()}
   def get_public_key_for_url(url) do
     with {:ok, %Actor{keys: keys}} <- Actors.get_or_fetch_by_url(url),
          {:ok, public_key} <- prepare_public_key(keys) do

lib/mobilizon/events/events.ex

@@ -579,6 +579,7 @@ defmodule Mobilizon.Events do
   @doc """
   Create a relation between two tags
   """
+  @spec create_tag_relation(map()) :: {:ok, TagRelation.t()} | {:error, Ecto.Changeset.t()}
   def create_tag_relation(attrs \\ {}) do
     %TagRelation{}
     |> TagRelation.changeset(attrs)