make it clear if we are on DEV or PROD -> pass env thru app.config to base.html

main.py

@@ -13,6 +13,7 @@ from flask_ldap3_login import LDAP3LoginManager
 from flask_login import LoginManager, login_user, login_required, UserMixin, current_user
 from flask_ldap3_login.forms import LDAPLoginForm
 
+import os
 import re
 import socket
 
@@ -29,6 +30,7 @@ app = Flask(__name__)
 
 app.config['SQLALCHEMY_DATABASE_URI'] = DB_URL
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+app.config['ENV'] = os.environ['FLASK_ENV']
 app.config.from_mapping( SECRET_KEY=b'\xd6\x04\xbdj\xfe\xed$c\x1e@\xad\x0f\x13,@G')
 
 # ldap config vars: (the last one is required, or python ldap freaks out)