No mention of how to authenticate the deployment, which is disappointing. See the repository for more.

• https://github.com/salto-io/salesforce-ci-cd-org-dev/blob/ca2177829b49b0fce1167ad4c93ea0190293f9ad/.github/workflows/push-master-branch.yml#L40C22-L40C97
• https://developer.salesforce.com/docs/atlas.en-us.sfdx_cli_reference.meta/sfdx_cli_reference/cli_reference_org_commands_unified.htm#cli_reference_org_login_sfdx-url_unified

Deployment: Significance of Branching for Continuous Delivery

The deployment of software in DevOps is based on Continuous Delivery. Continuous Delivery enables all kinds of changes, including new features, configuration changes, bug fixes and experiments, to be put into production safely and quickly in a sustainable manner. A Branching strategy and Base Truncs play an important role in this.