Add check-required workflow and release workflow

[pavlovic-ivan]

Description

This PR adds workflows for releasing built docker images for YHS, and a check-required workflow as in FML. There are a couple of prerequisites before merging this PR.

Prerequisites:

• create and install a new GitHub app with the check:write permissions
• add its credentials to a new create-check environment that can only be accessed by the main branch. Credentials are found in app settings. Look for app id, and create a private key for the app.
  • secrets should be named APP_ID and APP_PRIVATE_KEY and placed in the environment
• Create one more environment called release also accessed by the main branch
  • add two secrets DOCKER_PASSWORD and DOCKER_USERNAME. Docker password should be a PAT generated in Docker hub. add an environment variable called DOCKER_REPO in format <docker account>/<docker repository>`

Fixes: https://github.com/G-Research/gr-oss/issues/729