### What needs to get done It could be handy if a recurring repo could be mentioned only once, for example: ```yaml definitions: kubeflow-source: &kubeflow-source source: https://github.com/kubeflow/kubeflow source-type: git source-tag: v1.7-branch # upstream branch source-depth: 1 parts: backend: plugin: nil <<: *kubeflow-source ``` Currently this fails with: ``` Bad rockcraft.yaml content: - extra field 'definitions' not permitted in top-level configuration ``` ### Why it needs to get done If the same repo+tag are used multiple times, it could be easier to maintain and easier to read.