Merge pull request #290936 from benaryorg/doc_readme_table1

Here's an overview of the different branches:

| branch | `master` | `staging` | `staging-next` |

| branch | `master` | `staging-next` | `staging` |

| --- | --- | --- | --- |

| Used for development | ✔️ | ✔️ | ❌ |

| Built by Hydra | ✔️ | ❌ | ✔️ |

| [Mass rebuilds][mass-rebuild] | ❌ | ✔️ | ⚠️  Only to fix Hydra builds |

| Critical security fixes | ✔️ for non-mass-rebuilds | ❌ | ✔️ for mass-rebuilds |

| Automatically merged into | `staging-next` | - | `staging` |

| Manually merged into | - | `staging-next` | `master` |

| Used for development | ✔️ | ❌ | ✔️ |

| Built by Hydra | ✔️ | ✔️ | ❌ |

| [Mass rebuilds][mass-rebuild] | ❌ | ⚠️  Only to fix Hydra builds | ✔️ |

| Critical security fixes | ✔️ for non-mass-rebuilds | ✔️ for mass-rebuilds | ❌ |

| Automatically merged into | `staging-next` | `staging` | - |

| Manually merged into | - | `master` | `staging-next` |

The staging workflow is used for all main branches, `master` and `release-YY.MM`, with corresponding names:

- `master`/`release-YY.MM`