[CCUBE-2284] Remediate findings

[qroll]

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing apis or functionality to change)
• Documentation (change to documentation, comments or API descriptions)
• Tests (improvements to unit tests or E2E tests)
• Other (technical improvements, refactoring, or changes that don't fall into the above categories)

Description of changes

• Link to ticket
• Finding 1:
  • Split the workflows so that GitLab pipeline can only be accessed through release branches (when PR is merged and approved)
  • This is done in coordination with tightened access to these branches
  • Escape GitHub parameters before usage
• Finding 2:
  • Add a check for file name format (kebab-case)

Checklist

• Changes follow the project guidelines in CONTRIBUTING.md
• Updated documentation