PIMS-690 Update to database dockerfile to resolve Permission Denied error

[TaylorFries]

🎯 Summary

PIMS-690:

The following error were hit when rebuilding the database container with Docker.

------                                                                                                                                                                                                                               
 > [database 3/5] RUN mkdir -p /usr/config:
0.259 mkdir: cannot create directory '/usr/config': Permission denied
------
failed to solve: process "/bin/sh -c mkdir -p /usr/config" did not complete successfully: exit code: 1
make: *** [build] Error 17 

🔰 Checklist

• I have read and agree with the following checklist and am following the guidelines in our Code of Conduct document.

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation where required.
• I have tested my changes to the best of my ability.
• My changes generate no new warnings.