Implement Security Context for Horizon

Implement container security context for the following Horizon resources:
 - Horizon server deployment

Change-Id: I8202cd011f4c4f73d778c5f0ad2648440e259e5d

horizon/templates/deployment.yaml

@@ -46,8 +46,6 @@ spec:
         configmap-bin-hash: {{ tuple "configmap-bin.yaml" . | include "helm-toolkit.utils.hash" }}
         configmap-etc-hash: {{ tuple "configmap-etc.yaml" . | include "helm-toolkit.utils.hash" }}
     spec:
-      securityContext:
-        readOnlyRootFilesystem: true
       serviceAccountName: {{ $serviceAccountName }}
 {{ dict "envAll" $envAll "application" "horizon" | include "helm-toolkit.snippets.kubernetes_pod_security_context" | indent 6 }}
       affinity:
@@ -61,6 +59,7 @@ spec:
         - name: horizon
 {{ tuple $envAll "horizon" | include "helm-toolkit.snippets.image" | indent 10 }}
 {{ tuple $envAll $envAll.Values.pod.resources.server | include "helm-toolkit.snippets.kubernetes_resources" | indent 10 }}
+{{ dict "envAll" $envAll "application" "horizon" "container" "horizon" | include "helm-toolkit.snippets.kubernetes_container_security_context" | indent 10 }}
           securityContext:
             runAsUser: 0
           command:

horizon/values.yaml

@@ -1978,9 +1978,14 @@ dependencies:
           service: local_image_registry
 
 pod:
-  user:
+  security_context:
     horizon:
-      uid: 42424
+      pod:
+        runAsUser: 42424
+      container:
+        horizon:
+          readOnlyRootFilesystem: true
+          allowPrivilegeEscalation: false
   affinity:
     anti:
       type: