Fix oban jobs migrations (especially on PostgreSQL < 12)

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

priv/repo/migrations/20201114174929_fix_oban_migrations_for_older_postgre_sql_versions.exs

@@ -0,0 +1,15 @@
+defmodule Mobilizon.Storage.Repo.Migrations.FixObanMigrationsForOlderPostgreSQLVersions do
+  use Ecto.Migration
+
+  @disable_ddl_transaction true
+  def up do
+    Ecto.Adapters.SQL.query!(
+      Mobilizon.Storage.Repo,
+      "ALTER TYPE oban_job_state ADD VALUE IF NOT EXISTS 'cancelled'"
+    )
+  end
+
+  def down do
+    IO.puts("This migration doesn't handle being reverted.")
+  end
+end

priv/repo/migrations/20201114175249_upgrade_oban_jobs_to_v9.exs

@@ -0,0 +1,6 @@
+defmodule Mobilizon.Storage.Repo.Migrations.UpgradeObanJobsToV9 do
+  use Ecto.Migration
+
+  defdelegate up, to: Oban.Migrations
+  defdelegate down, to: Oban.Migrations
+end