WIP: Allow to add deploy keys with write-access

What does this MR do?

This MR allows to add deploy keys with write-access ability

Why was this MR needed?

Currently Deploy keys only had read-only access. Now with ability to add write-access on deploy key, we can build packages like releases, makes the tag (through CI) and prepare the next release, and of course push both of them commits to git repository

What are the relevant issue numbers?

Fixes #1376 (closed)

Screenshots

Before:

After:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together