Add docker_hub method

Will replace Ruby-implemented dockerhub method (only used by Amazon Linux at the moment.

docker_hub.py

@@ -0,0 +1,48 @@
+import json
+import re
+import sys
+from common import endoflife
+
+METHOD = "docker_hub"
+REGEX = r"^(?:(\d+\.(?:\d+\.)*\d+))$"
+
+
+def fetch_releases(url, regex, releases):
+    if not isinstance(regex, list):
+        regex = [regex]
+
+    response = endoflife.fetch_url(url)
+    data = json.loads(response)
+    for result in data["results"]:
+        version = result["name"]
+
+        matches = False
+        for r in regex:
+            if re.match(r, version):
+                matches = True
+
+        if matches:
+            date = result['tag_last_pushed'].split("T")[0]
+            releases[version] = date
+            print(f"{version}: {date}")
+
+    if data["next"]:
+        fetch_releases(data["next"], regex, releases)
+
+
+def update_product(product_name, configs):
+    releases = {}
+
+    for config in configs:
+        url = f"https://hub.docker.com/v2/repositories/{config[METHOD]}/tags?page_size=100&page=1"
+        config = {"regex": REGEX} | config
+        fetch_releases(url, config["regex"], releases)
+
+    endoflife.write_releases(product_name, releases)
+
+
+p_filter = sys.argv[1] if len(sys.argv) > 1 else None
+for product, configs in endoflife.list_products(METHOD, p_filter).items():
+    print(f"::group::{product}")
+    update_product(product, configs)
+    print("::endgroup::")

src/npm.py

@@ -4,9 +4,6 @@ import sys
 from common import endoflife
 
 METHOD = "npm"
-DEFAULT_TAG_TEMPLATE = (  # Same as used in Ruby (update.rb)
-    "{{major}}{% if minor %}.{{minor}}{% if patch %}.{{patch}}{%endif%}{%endif%}"
-)
 REGEX = r"^(?:(\d+\.(?:\d+\.)*\d+))$"