docs: analyse branch or MR commits only

This project implements a GitLab CI/CD template to detect and prevent hardcoded secrets in your 

Git repository with [Gitleaks](https://github.com/zricethezav/gitleaks/wiki).

When run on the master branch, Gitleaks will audit all commits from all branches.

When run on merge requests, Gitleaks will run a quick analysis of added commits (i.e. the diff).

When run on other branches, Gitleaks will run a quick analysis on the current branch.

When run on branches, Gitleaks will run an analysis of all commits in the branch.

## Usage