Add cache_duration to example config

src/Makefile

@@ -3,8 +3,9 @@
 -include .env
 
 URL ?= http://localhost:5001/pam-weblogin
-TOKEN ?= 1234
+TOKEN ?= Bearer 1234
 RETRIES ?= 3
+CACHE_DURATION ?= 60
 ATTRIBUTE ?= username
 prefix ?= /usr/local
 
@@ -70,7 +71,7 @@ pam_weblogin.so: $(OBJS) ../json-parser/libjsonparser.a
 install: pam_weblogin.so
 	install -d $(prefix)/lib/security/
 	install pam_weblogin.so $(prefix)/lib/security/
-	if [ ! -f /etc/pam-weblogin.conf ]; then echo "url=${URL}\ntoken = Bearer ${TOKEN}\nretries = ${RETRIES}\nattribute=${ATTRIBUTE}\n" | tee "/etc/pam-weblogin.conf"; fi
+	if [ ! -f /etc/pam-weblogin.conf ]; then echo "url=${URL}\ntoken = Bearer ${TOKEN}\nretries = ${RETRIES}\nattribute=${ATTRIBUTE}\ncache_duration=${CACHE_DURATION}\n" | tee "/etc/pam-weblogin.conf"; fi
 	if [ ! -f /etc/pam.d/weblogin ]; then echo "auth required $(prefix)/lib/security/pam_weblogin.so /etc/pam-weblogin.conf" | tee "/etc/pam.d/weblogin"; fi
 
 .PHONY: clean