feat(devops): database init and 1st migration

migrations/20240424184922_create_subscriptions_table.sql

@@ -0,0 +1,8 @@
+-- Add migration script here
+CREATE TABLE subscriptions(
+  id uuid NOT NULL,
+  PRIMARY KEY (id),
+  email TEXT NOT NULL UNIQUE,
+  name TEXT NOT NULL,
+  subscribed_at timestamptz NOT NULL
+);