WMS ID 11814: Change the db username in the .env file to lowercase

[Fatima-Aourga]

WMS ID: 11814

General requirements

1. Information in the workshop is adequate and updated
2. Code is correct and working
3. Links are correct
4. Make sure you enter the help email link in your manifest.json
5. Please make sure WMS URLs are updated as needed after your PR is approved

Checklist - Refer to the QA document for the complete list

Please confirm that the following is completed before submitting your PR

• All filenames are lower case (including folders, images, files, etc.)
• Filenames are descriptive
• Your workshop folder structure should be similar to the one used in the sample workshop (https://github.com/oracle-livelabs/common/tree/main/sample-livelabs-templates/sample-workshop)
• Are you using multiple versions (desktop/, sandbox/, tenancy/)? Make sure that each of them contains a manifest.json and an index.html
• Image references in markdown contain an alternate text