[SYSE-304]: Update release engineering code to be manageable by gromit templates

[asutosh]

This PR:

• Updates all the releng code to follow the current structure that is templated using gromit.(with the ci/ directory hierarchy and everything)
• Removes all the bits that are not relevant to the CLI app(service files, post install, pre install scripts for packages etc.)
• Fixes all the upgrade tests that were out of date.
• The version injection wasn't working correctly because the current VERSION string cmd.VERSION was a const so not injectable at build time, changes this to a var.
• Updates the Dockerfile to use a non-root user as sonarcloud was complaining - should not be an issue running as a non-root/non-system user as it's just a cli app.

[sweep-ai[bot]]

Apply Sweep Rules to your PR?

• [ ] Apply: All new business logic should have corresponding unit tests.
• [ ] Apply: Refactor large functions to be more modular.
• [ ] Apply: Add docstrings to all functions and file headers.

[sonarcloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud