feat: increment version in Makefile to 4; update db.py to support DATABASE_URL from environment variables

Makefile

@@ -1,5 +1,5 @@
 ENV=dev
-VER=3
+VER=4
 TAG=${ENV}-${VER}
 REGISTRY=kube-reg.fairfaxmedia.net
 SVC=papi/svc1

db.py

@@ -1,10 +1,13 @@
 from sqlalchemy import create_engine, Column, Integer,String, ForeignKey
 from sqlalchemy.engine import URL
 from sqlalchemy.orm import sessionmaker, Session, declarative_base
-
+import os
 
 # Database setup
 DATABASE_URL = "sqlite:///./test.db"
+if os.getenv("DATABASE_URL"):
+    DATABASE_URL = os.getenv("DATABASE_URL")
+    
 engine = create_engine(DATABASE_URL)
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 Base = declarative_base()