Switch to sqlite (#22)

* Updated project to use sqlite

* Edited migrations directly because I fear no man

* Updated search functions and tests to work with sqlite

* Updated build tools to remove postgres

priv/repo/migrations/20240125212753_create_tasks.exs

@@ -4,13 +4,13 @@ defmodule Pinchflat.Repo.Migrations.CreateTasks do
   def change do
     create table(:tasks) do
       add :job_id, references(:oban_jobs, on_delete: :delete_all), null: false
-      # `restrict` because we need to be sure to delete pending tasks when a channel is deleted
-      add :channel_id, references(:channels, on_delete: :restrict), null: true
+      # `restrict` because we need to be sure to delete pending tasks when a source is deleted
+      add :source_id, references(:sources, on_delete: :restrict), null: true
 
       timestamps(type: :utc_datetime)
     end
 
     create index(:tasks, [:job_id])
-    create index(:tasks, [:channel_id])
+    create index(:tasks, [:source_id])
   end
 end