helm: refactor securityContext to support restricted pod security standard

Signed-off-by: Simon L. <szaimen@e.mail.de>

nextcloud-aio-helm-chart/templates/nextcloud-aio-imaginary-deployment.yaml

@@ -22,24 +22,38 @@ spec:
       labels:
         io.kompose.service: nextcloud-aio-imaginary
     spec:
+      securityContext:
+        # The items below only work in pod context
+        fsGroup: 65534
+        fsGroupChangePolicy: "OnRootMismatch"
+        # The items below work in both contexts
+        runAsUser: 65534
+        runAsGroup: 65534
+        runAsNonRoot: true
+        {{- if eq .Values.RPSS_ENABLED "yes" }}
+        seccompProfile:
+          type: RuntimeDefault
+        {{- end }}
       containers:
         - env:
             - name: IMAGINARY_SECRET
               value: "{{ .Values.IMAGINARY_SECRET }}"
             - name: TZ
               value: "{{ .Values.TIMEZONE }}"
-          image: "nextcloud/aio-imaginary:20241106_101604"
+          image: nextcloud/aio-imaginary:20241106_101604
           name: nextcloud-aio-imaginary
           ports:
             - containerPort: 9000
               protocol: TCP
           securityContext:
+            # The items below only work in container context
             allowPrivilegeEscalation: false
-            runAsNonRoot: true
             capabilities:
+              {{- if eq .Values.RPSS_ENABLED "yes" }}
+              drop: ["ALL"]
+              {{- else }}
+              drop: ["NET_RAW"]
+              {{- end }}
               add:
-                - SYS_NICE
-              drop:
-                - NET_RAW
-            runAsUser: 65534
+                - NET_BIND_SERVICE
 {{- end }}