Create users for graphana and data connection with backend rds on pre-prod ec2

[VimanyuAgg]

Create users for graphana and data connection with backend rds on pre-prod ec2
Options available:

• Do via UI
• Write JSON code - still need to handle sensitive env variable setup (maybe via github-actions?)

[VimanyuAgg]

Need to check if github actions cannot work without making repo public.