Allow group packages to add or subtract from the default versions

package-list.yaml

@@ -41,3 +41,8 @@ configurations:
         graphql-kotlin-ktor-server: ["latest"]
         graphql-kotlin-client: []
         graphql-kotlin-client-generator: []
+
+      io.insert-koin:
+        _versions: ['3.3.0', '3.2.2']
+        koin-core: []
+        koin-ktor: ['default', '-3.3.0', '3.2.1']

sync/src/config/packages.py

@@ -52,8 +52,17 @@ def handle_packages(section) -> list[Package]:
                         if isinstance(value, str):
                             result.append(Package(group_id, artifact_id, value))
                         elif isinstance(value, list):
+                            versions: set[str] = set()
+
                             for version in value:
-                                result.append(Package(group_id, artifact_id, version))
+                                if version == 'default':
+                                    versions.update(default_versions)
+                                elif version.startswith('-'):
+                                    versions.remove(version[1:])
+                                else:
+                                    versions.add(version)
+
+                            result.extend([Package(group_id, artifact_id, version) for version in versions])
                         else:
                             logger.warning(f'Invalid versions "{value}" for "{group_id}:{artifact_id}"')
             else: