feat: add in-built db migrator

- fix docker builds
- fix binary builds

pkg/postgres/pool.go

@@ -2,13 +2,20 @@ package postgres
 
 import (
 	"context"
+	"os"
 	"time"
 
 	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/jackc/tern/v2/migrate"
+)
+
+const (
+	schemaTable = "schema_version"
 )
 
 type PostgresPoolOpts struct {
-	DSN string
+	DSN                  string
+	MigrationsFolderPath string
 }
 
 // NewPostgresPool creates a reusbale connection pool across the cic-custodial component.
@@ -26,7 +33,22 @@ func NewPostgresPool(o PostgresPoolOpts) (*pgxpool.Pool, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 
-	if err := dbPool.Ping(ctx); err != nil {
+	conn, err := dbPool.Acquire(ctx)
+	if err != nil {
+		return nil, err
+	}
+	defer conn.Release()
+
+	migrator, err := migrate.NewMigrator(ctx, conn.Conn(), schemaTable)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := migrator.LoadMigrations(os.DirFS(o.MigrationsFolderPath)); err != nil {
+		return nil, err
+	}
+
+	if err := migrator.Migrate(ctx); err != nil {
 		return nil, err
 	}