adding namespace to ksonnet config, moved images into a config file

.gitignore

-loki-canary
+./loki-canary
\ No newline at end of file

production/ksonnet/loki-canary/config.libsonnet

+{
+  _images+:: {
+    loki_canary: 'grafana/loki-canary:latest',
+  },
+}
\ No newline at end of file

production/ksonnet/loki-canary/loki-canary.libsonnet

 local k = import 'ksonnet-util/kausal.libsonnet';
+local config = import 'config.libsonnet';
+
+k + config {
+  namespace: $.core.v1.namespace.new($._config.namespace),
 
-k {
   local container = $.core.v1.container,
 
   loki_canary_args:: {
     labelvalue: "$(POD_NAME)",
   },
 
-  _images+:: {
-    loki_canary: 'grafana/loki-canary:latest',
-  },
-
   loki_canary_container::
     container.new('loki-canary', $._images.loki_canary) +
     container.withPorts($.core.v1.containerPort.new('http-metrics', 80)) +