Align custom scripts with generic scripts (#445)

Align custom scripts with generic scripts, making them configurable. This has a few advantages:

- script code is more unified,
- no more hard-coded method names in scripts, which is less error prone and make it easier to rename scripts,
- no more hard coded product names in scripts, which is less error prone and make it easier to rename products,
- less hard-coded URLs and regexes in scripts, which makes auto-configuration more expressive / updatable,

Also added method `endoflife.list_configs_from_argv()` so that it is easier to manipulate scripts arguments.

src/rocky-linux.py

@@ -1,10 +1,11 @@
 from common import dates, endoflife, http, releasedata
 
-with releasedata.ProductData("rocky-linux") as product_data:
-    response = http.fetch_url("https://raw.githubusercontent.com/rocky-linux/wiki.rockylinux.org/main/docs/include/releng/version_table.md")
-    for line in response.text.strip().split('\n'):
-        items = line.split('|')
-        if len(items) >= 5 and endoflife.DEFAULT_VERSION_PATTERN.match(items[1].strip()):
-            version = items[1].strip()
-            date = dates.parse_date(items[3])
-            product_data.declare_version(version, date)
+for config in endoflife.list_configs_from_argv():
+    with releasedata.ProductData(config.product) as product_data:
+        response = http.fetch_url(config.url)
+        for line in response.text.strip().split('\n'):
+            items = line.split('|')
+            if len(items) >= 5 and config.first_match(items[1].strip()):
+                version = items[1].strip()
+                date = dates.parse_date(items[3])
+                product_data.declare_version(version, date)