SD3 deployment improvement

[vladimirvshivkov]

The initial development process is complete. We need to improve our CD pipelines. What I want to achieve:

1. Automate deployment from the main branch to our test instances.
2. Automate deployment from the tag to our prod environment.

[vladimirvshivkov]

@sgmv
what exactly do you want to automate?

[vladimirvshivkov]

After clarifications with @sgmv, the task is to create pr with new imagetag to stackmon-config after the successful build of the SD3 front and api images