Creating automatic image rotation news updates

This MR introduces:

Automatic updating of news section with image rotation updates

Why:

Goal of image rotation mechanism was to develop fully automatic mechanism -> no need for merge request etc.

https://gitlab.ics.muni.cz/cloud/internal-wiki/-/issues/456

ci/image_rotation_news_gen.py

+"""Generated dynamically image rotation news updates"""
+
+import re
+import datetime
+
+DOC_NEWS_FILE = "content/cloud/news/index.md"
+IMAGE_ROTATION_FILE = "content/cloud/image-rotation/index.md"
+
+
+def get_image_update_log_dates():
+    """Gets all image rotation update dates"""
+    with open(IMAGE_ROTATION_FILE, "r", encoding="utf-8") as rotate_file:
+        file_content = rotate_file.read()
+        return re.findall(
+            r"## Image rotation update from [0-9]{4}-[0-9]{2}-[0-9]{2}:", file_content
+        )
+
+
+def generate_news(image_update_dates):
+    """Generates news with image update news"""
+    with open(DOC_NEWS_FILE, "r", encoding="utf-8") as news_file:
+        news_content = news_file.readlines()
+        news_content = [line.strip() for line in news_content]
+
+    for update_date in image_update_dates:
+        update_date = datetime.datetime.strptime(
+            update_date, "## Image rotation update from %Y-%m-%d:"
+        )
+
+        for line_idx, line in enumerate(news_content):
+            if re.match(r".*\*\*[0-9]{4}-[0-9]{2}-[0-9]{2}\*\*.*", line):
+                news_date = line.split("**")[1]
+                news_date = datetime.datetime.strptime(news_date, "%Y-%m-%d")
+                if update_date > news_date or line_idx == len(news_content) - 1:
+                    update_date = datetime.datetime.strftime(update_date, "%Y-%m-%d")
+                    new_entry = [
+                        f"**{update_date}** Image rotation update, details [here](https://docs.cloud.muni.cz/"
+                        f"cloud/image-rotation/image-rotation-update-from-{update_date})",
+                    ]
+                    news_content = (
+                        news_content[:line_idx] + new_entry + [""] + news_content[line_idx:]
+                        if line_idx != len(news_content) - 1
+                        else news_content + [""] + new_entry
+                    )
+                    break
+    with open(DOC_NEWS_FILE, "w", encoding="utf-8") as news_file:
+        news_file.write("\n".join(news_content))
+
+
+if __name__ == "__main__":
+    IMAGE_UPDATE_DATES = get_image_update_log_dates()
+    if IMAGE_UPDATE_DATES:
+        generate_news(IMAGE_UPDATE_DATES)