fix fireflyiii cronjob

cluster/apps/default/fireflyiii/daily-cronjob.yaml

@@ -14,9 +14,11 @@ spec:
         spec:
           containers:
           - name: firefly-cronjob
-            image: alpine
+            image: frolvlad/alpine-bash
             imagePullPolicy: IfNotPresent
             command:
+            - /bin/bash
+            - -c
             - wget -qO- http://firefly-iii:8080/api/v1/cron/$(cat /etc/crontoken)
             volumeMounts:
             - name: ff-secret