As a maintainer, I want to be able to monitor the app health

[kasramp]

Need to use Spring Actuator to be able to access the health endpoints. However, this endpoints should be secured. A basic approach is using environment variables and then later add the part for the database if needed.
Criteria:

• Basic auth, salted password, for /actuator.
• Response accordingly if an unauthorized entity tried to access, instead of redirecting to the white label page.
• Write unit tests.