[ci] fix getting status of optional workflows in PRs with a lot of comments (#4806)

* Update get_workflow_status.py

* Update get_workflow_status.py

.ci/get_workflow_status.py

@@ -33,15 +33,26 @@ def get_runs(trigger_phrase):
     pr_runs = []
     if environ.get("GITHUB_EVENT_NAME", "") == "pull_request":
         pr_number = int(environ.get("GITHUB_REF").split('/')[-2])
-        req = request.Request(url="{}/repos/microsoft/LightGBM/issues/{}/comments".format(environ.get("GITHUB_API_URL"),
-                                                                                          pr_number),
-                              headers={"Accept": "application/vnd.github.v3+json"})
+        page = 1
+        while True:
+            req = request.Request(
+                url="{}/repos/microsoft/LightGBM/issues/{}/comments?page={}&per_page=100".format(
+                    environ.get("GITHUB_API_URL"),
+                    pr_number,
+                    page
+                ),
+                headers={"Accept": "application/vnd.github.v3+json"}
+            )
             url = request.urlopen(req)
             data = json.loads(url.read().decode('utf-8'))
             url.close()
-        pr_runs = [i for i in data
+            if not data:
+                break
+            runs_on_page = [i for i in data
                             if i['author_association'].lower() in {'owner', 'member', 'collaborator'}
                             and i['body'].startswith('/gha run {}'.format(trigger_phrase))]
+            pr_runs.extend(runs_on_page)
+            page += 1
     return pr_runs[::-1]