[rockylinux] Add release automation

Closes #109.

The diff is fairly normal, with a slight
shift of dates, which is acceptable.

```diff
-json["8.5"] = "2021-11-16";
-json["8.6"] = "2022-05-17";
-json["8.7"] = "2022-11-16";
+json["8.5"] = "2021-11-15";
+json["8.6"] = "2022-05-15";
+json["8.7"] = "2022-11-11";
+json["8.8"] = "2023-05-20";
-json["9.1"] = "2022-11-28";
+json["9.1"] = "2022-11-26";
```

src/rockylinux.py

@@ -0,0 +1,33 @@
+import re
+from common import endoflife
+from datetime import datetime
+
+URL = "https://raw.githubusercontent.com/rocky-linux/wiki.rockylinux.org/development/docs/include/releng/version_table.md"
+REGEX = r"^(\d+\.\d+)$"
+
+def parse_date(date_str):
+    date_str = date_str.replace(',', '').strip()
+    date_obj = datetime.strptime(date_str, "%B %d %Y")
+    return date_obj.strftime("%Y-%m-%d")
+
+def parse_markdown_table(table_text):
+    lines = table_text.strip().split('\n')
+    versions = {}
+
+    for line in lines:
+        items = line.split('|')
+        if len(items) >=5 and re.match(REGEX, items[1].strip()):
+            version = items[1].strip()
+            date = parse_date(items[3])
+            print(f"{version}: {date}")
+            versions[version] = date
+
+    return versions
+
+print("::group::rockylinux")
+response = endoflife.fetch_url(URL)
+
+versions = parse_markdown_table(response)
+endoflife.write_releases('rockylinux', versions)
+
+print("::endgroup::")