Fix for Gitlab - failed to push some refs

Problem:

After I make git push to gitlab repository I got an error:

! [remote rejected] main -> main (pre-receive hook declined)
error: failed to push some refs to 'gitlab.com:my_username/my_project_name.git'

Solution:

There is a problem with Protected branches.

Probably you make git push to master or main branch which are by default protected on gitlab. 

There are 2 solutions:

1. make feature_branch and make merge request to master or main branch
2. unprotect master or main branch (we will be able to push to master or main branch)

Steps to unprotect a branch in gitlab:

1. Go to your project and select Settings -> Repository.
2. Expand Protected branches.
3. Click 'Unprotect' button

Here is a screenshot how to do that: