software/grafana: promise to wait for frontend to be available

This is required, otherwise published URL in slapos master is `"None"`

software/grafana/buildout.hash.cfg

@@ -15,7 +15,7 @@
 
 [instance-profile]
 filename = instance.cfg.in
-md5sum = 0edf9e67bc637d73a7415124c8082a8c
+md5sum = 13f4f3806522b265dd1912ff169d146d
 
 [influxdb-config-file]
 filename = influxdb-config-file.cfg.in

software/grafana/instance.cfg.in

@@ -267,6 +267,10 @@ config-url = ${grafana:url}
 config-https-only = true
 return = domain secure_access
 
+[apache-frontend-available-promise]
+<= check-url-available-promise
+url = ${apache-frontend:connection-secure_access}
+
 
 [promises]
 recipe =
@@ -277,6 +281,8 @@ instance-promises =
   ${grafana-listen-promise:path}
   ${loki-listen-promise:path}
   ${promtail-listen-promise:path}
+  ${promtail-listen-promise:path}
+  ${apache-frontend-available-promise:path}
 
 
 [publish-connection-parameter]