(feat) Standardise and Harden default app securitycontext (#1028)

* Apply security hardened defaults to values.yaml for all apps

* Add default common securityContext to all apps

* Adjust securityContext defaults in questions.yaml, according to values.yaml

* Add default common podSecurityContext to all apps

* Clean whitespace

* Clean more whitespace

* Adjust podSecurityContext defaults in questions.yaml, according to values.yaml

* fix pgadmin

Co-authored-by: Stavros kois <s.kois@outlook.com>

charts/stable/nullserv/values.yaml

@@ -18,17 +18,11 @@ image:
   pullPolicy: IfNotPresent
 
 securityContext:
-  privileged: false
-  readOnlyRootFilesystem: false
-  allowPrivilegeEscalation: true
   runAsNonRoot: false
 
 podSecurityContext:
   runAsUser: 0
   runAsGroup: 0
-  fsGroup: 0
-  supplementalGroups: []
-  fsGroupChangePolicy: "OnRootMismatch"
 
 # -- environment variables. See more environment variables in the [nullserv documentation](https://github.com/bmrzycki/nullserv/blob/master/README.md).
 # @default -- See below
@@ -49,7 +43,6 @@ service:
         enabled: true
         port: 443
 
-
 # -- Configures the probes for the main Pod.
 # @default -- See values.yaml
 probes: