Add missing main.go

.gitignore

@@ -1,3 +1,3 @@
 shelves.db
 shelves.db*
-shelves
+/shelves

cmd/shelves/main.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+
+	_ "github.com/mattn/go-sqlite3"
+
+	"git.soup.land/soup/shelves/internal/db"
+	"git.soup.land/soup/shelves/internal/httpx"
+	"git.soup.land/soup/shelves/internal/routes"
+)
+
+func main() {
+	db, migrateResult, err := db.Open("./shelves.db")
+	if err != nil {
+		log.Fatalf("Failed to open DB: %v", err)
+	}
+	if migrateResult.MigrationError != nil {
+		log.Printf("An error was encountered while upgrading the database schema. You are on version %v, but the latest is %v. The error was: %v", migrateResult.SchemaVerNew, migrateResult.SchemaVerLatest, migrateResult.MigrationError)
+	}
+	schemaNeedsUpdating := migrateResult.SchemaVerNew != migrateResult.SchemaVerLatest
+	if schemaNeedsUpdating {
+		log.Printf("Your database schema needs to be updated. The application will continue to run, but you may encounter errors.\n")
+	}
+
+	routes := routes.Routes(db)
+	fmt.Println("Listening on localhost:8999")
+	http.ListenAndServe("localhost:8999", httpx.Log(routes))
+}