refactor(anti-spam): make anti-spam agnostic from Akismet

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

config/config.exs

@@ -378,6 +378,8 @@ config :mobilizon, Mobilizon.Service.GlobalSearch.SearchMobilizon,
     img_src: ["search.joinmobilizon.org"]
   ]
 
+config :mobilizon, Mobilizon.Service.AntiSpam, service: Mobilizon.Service.AntiSpam.Akismet
+
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
 import_config "#{config_env()}.exs"

config/test.exs

@@ -90,6 +90,8 @@ config :junit_formatter, report_dir: "."
 
 config :mobilizon, :http_security, report_uri: "https://endpoint.com"
 
+config :mobilizon, Mobilizon.Service.AntiSpam, service: Mobilizon.Service.AntiSpam.Mock
+
 if System.get_env("DOCKER", "false") == "false" && File.exists?("./config/test.secret.exs") do
   import_config "test.secret.exs"
 end