fix: drop airgapped support for Insights flags that use `bitnami-shel…

…l` (#1796)

fix: drop airgapped support for Insights flags that use `bitnami-shell`  (#1787)

fix: drop support for `tls` and `volumePermissions` in airgapped Insights Postgres
(cherry picked from commit f4511ce)

Co-authored-by: Andrei Sekretenko <asekretenko@users.noreply.github.com>

services/dkp-insights/1.0.1/helmrelease/list-images-values.yaml

@@ -1,8 +1,11 @@
 postgresql:
   metrics:
     enabled: true
-  volumePermissions:
-    enabled: true
+  # These sections are not supported because the `bitnami-shell` image required by them
+  # contains a number of critical vulnerabilities that are hard to remove:
+  #
+  # volumePermissions:
+  # tls:
 nova:
   helmRepositoryURLs: ["https://mesosphere.github.io/charts/stable"]
 trivy: