mrhlpr: pipeline: add support for Alpine's dynamic dowstream pipelines

Fixes #30

mrhlpr/gitlab.py

@@ -29,7 +29,7 @@ class GitLabOrigin:
     username: Optional[str]
 
 
-def download_json(origin: GitLabOrigin, pathname: str, no_cache: bool = False) -> dict[str, Any]:
+def download_json(origin: GitLabOrigin, pathname: str, no_cache: bool = False) -> Any:
     """Download and parse JSON from an API, with a cache.
 
     :param origin: gitlab origin information, see gitlab.parse_git_origin()

mrhlpr/pipeline.py

@@ -30,6 +30,18 @@ class PipelineMetadata:
                 f" status '{pipeline_status}' instead of 'success'"
             )
 
+        if origin.project == "alpine":
+            trigger_jobs = gitlab.download_json(
+                origin,
+                f"/projects/{pipeline_project_id}/pipelines/{pipeline_id}/bridges",
+                True,
+            )
+            if trigger_jobs:
+                if len(trigger_jobs) != 1:
+                    raise RuntimeError(f"Unexpected number of jobs: got {trigger_jobs} instead of 1")
+                pipeline_id = trigger_jobs[0]["downstream_pipeline"]["id"]
+                pipeline_project_id = trigger_jobs[0]["downstream_pipeline"]["project_id"]
+
         # Query the jobs of the pipeline (without cache, the result may change e.g.
         # if this ran earlier while the pipeline was not successful and now it is)
         api_pipeline_jobs = gitlab.download_json(