ci: adjust expire time for CI artifacts:

set shorter time to save some space on server. For those artifacts need
to be stored for long time, we can manually press "keep" button in job page.

Also add a CI job to check if all artifacts have set expire time.

tools/ci/check_artifacts_expire_time.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python
+
+# internal use only
+# check if expire time is set for all artifacts
+
+import os
+
+import yaml
+
+IDF_PATH = os.getenv("IDF_PATH")
+if not IDF_PATH:
+    print("Please set IDF_PATH before running this script")
+    raise SystemExit(-1)
+
+GITLAB_CONFIG_FILE = os.path.join(os.getenv("IDF_PATH"), ".gitlab-ci.yml")
+
+
+def check_artifacts_expire_time():
+    with open(GITLAB_CONFIG_FILE, "r") as f:
+        config = yaml.load(f)
+
+    errors = []
+
+    print("expire time for jobs:")
+
+    job_names = config.keys()
+    job_names.sort()
+
+    for job_name in job_names:
+
+        if job_name.startswith("."):
+            # skip ignored jobs
+            continue
+
+        try:
+            if "expire_in" not in config[job_name]["artifacts"]:
+                errors.append(job_name)
+            else:
+                print("{}: {}".format(job_name, config[job_name]["artifacts"]["expire_in"]))
+        except (KeyError, TypeError):
+            # this is not job, or the job does not have artifacts
+            pass
+
+    if errors:
+        print("\n\nThe following jobs did not set expire time for its artifacts")
+        for error in errors:
+            print(error)
+        raise SystemExit(-2)
+
+
+if __name__ == '__main__':
+    check_artifacts_expire_time()