init repo

priv/repo/migrations/.formatter.exs

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+[
+  import_deps: [:ecto_sql],
+  inputs: ["*.exs"]
+]

priv/repo/seeds.exs

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+# Script for populating the database. You can run it as:
+#
+#     mix run priv/repo/seeds.exs
+#
+# Inside the script, you can read and write to any of your
+# repositories directly:
+#
+#     Blog.Repo.insert!(%Blog.SomeSchema{})
+#
+# We recommend using the bang functions (`insert!`, `update!`
+# and so on) as they will fail if something goes wrong.