Update README.md (#1622)

Directory traversal needed prior to 'bun docker:up' is run (from root)

Signed-off-by: Kevin <kevin@match2.jobs>
Co-authored-by: Mariano Fuentes <marfuen98@gmail.com>

Author: kevinATmatch2DOTjobs

README.md

@@ -217,6 +217,7 @@ Start and initialize the PostgreSQL database using Docker:
 1. Start the database:
 
    ```sh
+   cd packages/db
    bun docker:up
    ```