new pipeline stage to check ical file

.gitlab-ci.yml

@@ -21,6 +21,15 @@ check for dead links:
         - env LANG=en_US.UTF-8 bundle exec jekyll build
         - linkchecker --no-status --check-extern --ignore-url '!chaotikum.org' --ignore-url '/blog/20(13|14|15|16|17|18)/.*' --no-warnings _site/ | sed -e "s|$CI_PROJECT_DIR||g"
 
+check ical files:
+    stage: test
+    allow_failure: true
+    before_script:
+        -pip3 install "requests==2.28.2"
+        -pip3 install "icalendar=5.0.7"
+    script:
+        - python3 check_ical.py   
+
 create media tickets:
     stage: test
     allow_failure: true

check_ical.py

+from icalendar import Calendar
+import requests
+import sys
+
+print("get ics from url")
+text = requests.get("https://chaotikum.org/events.ics").text
+try:
+    print("read ics")
+    c = Calendar.from_ical(text)
+except:
+    print("ERROR: ical file not valid")
+    sys.exit(1)