[TASK] Implement GitFlow to the repo

# As a dev

# I Want to Implement GitFlow to the repo

# Description
Implement GitFlow to the repo, to make version management easier

# DoD
- [ ] deny incoming push on main branch
- [ ] default branch is dev
- [ ] add pull request template
- [ ] run the packaging task (#15) only on main branch

# Load
1 day / H