fix(helm): set fsGroup to zero for local opensearch deployment (rea…

…nahub#843)

When deploying REANA locally, allow OpenSearch to access root-owned
directory by setting `fsGroup` to zero. This is needed to access
`hostPath` volumes when deploying reana with kind and Docker.

helm/configurations/values-dev.yaml

@@ -64,6 +64,8 @@ opensearch:
           key: OPENSEARCH_INITIAL_ADMIN_PASSWORD
   secretMounts: []
   customSecurityConfig:
+  podSecurityContext:
+    fsGroup: 0
 
 # FluentBit configuration for dev environment
 fluent-bit: