Refactor scripts arguments handling (#456)

- remove the use of environment variables to get directory paths,
- make use of arguments / argparse instead of environment variables in `update.py` and `report.py`,
- automatically guess the data directory in `latest.py` based on the script's location,
- propagate log level to auto scripts,
- move `list_configs_from_argv` from `endoflife` module to `releasedata` module,
- use `list_products` in `latest.py` to load the product's frontmatters.

report.py

@@ -1,20 +1,28 @@
+import argparse
 import time
+from pathlib import Path
 
 from src.common import endoflife
 
-products = endoflife.list_products()
-count_auto = len([product for product in products if product.auto_configs()])
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description='Create report on product automation.')
+    parser.add_argument('-p', '--product-dir', required=True, help='path to the product directory')
+    args = parser.parse_args()
 
-print(f"As of {time.strftime('%Y-%m-%d')}, {count_auto} of the {len(products)} products"
-      f" tracked by endoflife.date have automatically tracked releases:")
-print()
-print('| Product | Permalink | Auto | Method(s) |')
-print('|---------|-----------|------|-----------|')
-for product in products:
-    title = product.get_title()
-    permalink = product.get_permalink()
-    auto = '✔️' if product.has_auto_configs() else '❌'
-    methods = ', '.join(sorted({config.method for config in product.auto_configs()}))
-    print(f"| {title} | [`{permalink}`](https://endoflife.date{permalink}) | {auto} | {methods} |")
-print()
-print('This table has been generated by [report.py](/report.py).')
+    products_dir = Path(args.product_dir)
+    products = endoflife.list_products(products_dir)
+    count_auto = len([product for product in products if product.auto_configs()])
+
+    print(f"As of {time.strftime('%Y-%m-%d')}, {count_auto} of the {len(products)} products"
+          f" tracked by endoflife.date have automatically tracked releases:")
+    print()
+    print('| Product | Permalink | Auto | Method(s) |')
+    print('|---------|-----------|------|-----------|')
+    for product in products:
+        title = product.get_title()
+        permalink = product.get_permalink()
+        auto = '✔️' if product.has_auto_configs() else '❌'
+        methods = ', '.join(sorted({config.method for config in product.auto_configs()}))
+        print(f"| {title} | [`{permalink}`](https://endoflife.date{permalink}) | {auto} | {methods} |")
+    print()
+    print('This table has been generated by [report.py](/report.py).')