Create timer function to initialise card database from filesystem (#14)

- Create a new datasource for an in-memory sqlite database
- Create a setup function to initialise the card database

#13

Reviewed-on: https://gitea.vylpes.xyz/External/card-drop/pulls/14
Co-authored-by: Ethan Lane <ethan@vylpes.com>
Co-committed-by: Ethan Lane <ethan@vylpes.com>

package.json

@@ -32,6 +32,7 @@
     "jest-mock-extended": "^3.0.0",
     "minimatch": "9.0.2",
     "mysql": "^2.18.1",
+    "sqlite3": "^5.1.6",
     "ts-jest": "^29.0.0",
     "typeorm": "0.3.17"
   },