add label extract script

python/docker-compose-labels.py

@@ -0,0 +1,13 @@
+import yaml
+
+LABEL = "leuchtturm.enable"
+
+with open(0) as f:
+    res = yaml.safe_load(f)
+
+for key, service in res["services"].items():
+    if "labels" not in service:
+        continue
+    labels = service["labels"]
+    if LABEL in labels:
+        print(key, end=" ")