(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/pihole/values.yaml

@@ -5,6 +5,14 @@ image:
   pullPolicy: IfNotPresent
   tag: v2021.09@sha256:e043ab188da4c36abb11d70d82bbfb394ef5054abff21dafbaf54bc21861bd1e
 
+securityContext:
+  readOnlyRootFilesystem: false
+  runAsNonRoot: false
+
+podSecurityContext:
+  runAsUser: 0
+  runAsGroup: 0
+
 envFrom:
   - configMapRef:
       name: pihole-env
@@ -33,7 +41,6 @@ pihole:
   DNS1: "9.9.9.9"
   DNS2: "149.112.112.112"
 
-
 persistence:
   config:
     enabled: true