Add task to fetch and store codespaces metrics

As the codespaces data will change over time and deleted codespaces
will disappear from the API, we do not drop and recreate the table
each time the task is run as per the other tasks. Instead, calling
the upsert() method ensures the table exists then merges the new
data with the existing.

metrics/github/metrics.py

@@ -75,3 +75,7 @@ def convert_issue_counts_to_metrics(counts):
             }
         )
     return metrics
+
+
+def get_codespaces_data(codespaces):
+    return [vars(c) for c in codespaces]

metrics/tasks/codespaces.py

@@ -0,0 +1,23 @@
+import sys
+
+import structlog
+
+import metrics.github.github as github
+from metrics.timescaledb import db, tables
+
+
+log = structlog.get_logger()
+
+
+def main():
+    log.info("Getting codespaces")
+    codespaces = github.codespaces(org="opensafely")
+    log.info(f"Got {len(codespaces)} codespaces")
+
+    log.info("Writing data")
+    db.upsert(tables.GitHubCodespaces, [vars(c) for c in codespaces])
+    log.info("Written data")
+
+
+if __name__ == "__main__":
+    sys.exit(main())