Promotion strategy workflow

[smongiar]

Implementation of a promotion strategy logic, and deployment from one environment to another.

Currently, the procedure requires that the build pipeline automatically manages the deployments in the following way:

• deploy into development env (auto)
• deploy from dev to staging (if code analysis passes the quality gate)
• deploy from staging to production (if cve scan analysis completes without critical CVEs)

Each deploy consists of a GitHub pull request that needs to be approved manually (three branches are involved: main - staging - production)