Adding codeowners file creation script

[SonOfLope]

This pull request gives the following :

• update ruleset for branch protection to require review from code owners
• sh script that creates a CODEOWNERS file in repo's which names end with "backend", "frontend" or "db". Also adds devops teams as code owners for all .github folder and Dockerfiles/docker-compose files across all repositories.

[rngadam]

Seems like the repository devops itself is lacking the Github Workflows to lint markdown and would need linter setup for shell scripts.

[SonOfLope]

Shellcheck will be used with the action shell-linter.
I applied Shellcheck for the current pull request to make sure it passes the check. The following issue will add the reusable action workflow.

[SonOfLope]

Added sh check workflow. The pipeline wont work for now since we need to wait until the workflow gets merged on github-workflow.

As for the newline, the workflow seems to run but doesnt detect that the file doesnt have new line :

I will investigate.

[rngadam]

I will investigate.

Suggest referencing the issue into which the investigation / fix is being done. Also good place to use "Reference in new issue".

[rngadam]

see comment on linking to related issues.