Add security scanners to the pipeline

[pmoros]

Security scanners should be added to repository so as to reduce the chance of having security problems in the future. A initial proposal is adding a security-scanners.yml workflow to the current Github Actions. This would perform these actions:

1. Check Gitleaks: verify that there aren't any leaks in the repository such as API Keys, Tokens or any other credentials
2. Perform security checks: this checks if there is any sort of vulnerability regarding to our dependencies, a deprecated library of a new vulnerability in our runtime for example.