Add package initialization subcommand and package

pkg/codegen/tpl/mount.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+sudo mount -t tmpfs -o size=100M tmpfs sample_data/data

pkg/codegen/tpl/reset.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+rm sample_data/data/* || true
+
+go run ./cmd init
+sqlite3 sample_data/data/{{ .DBFilename }} < sample_data/seed.sql

pkg/codegen/tpl/schema.sql

@@ -0,0 +1,10 @@
+PRAGMA foreign_keys = on;
+
+-- =======
+-- DB meta
+-- =======
+
+create table db_version (
+    version integer not null
+) strict;
+insert into db_version values(0);