Add passwords generation to FerretDB (#329)

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Updated application version from 0.3.0 to 0.4.0, indicating a new
release.
- Introduced a new Kubernetes Role for managing access to
dashboard-related resources, enhancing security.
- Improved user credential management with dynamic password generation
in the initialization script, enhancing security practices.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

packages/apps/ferretdb/Chart.yaml

@@ -16,7 +16,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.3.0
+version: 0.4.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to

packages/apps/ferretdb/templates/dashboard-resourcemap.yaml

@@ -0,0 +1,19 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: {{ .Release.Name }}-dashboard-resources
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - services
+  resourceNames:
+  - {{ .Release.Name }}
+  verbs: ["get", "list", "watch"]
+- apiGroups:
+  - ""
+  resources:
+  - secrets
+  resourceNames:
+  - {{ .Release.Name }}-credentials
+  verbs: ["get", "list", "watch"]

packages/apps/ferretdb/templates/init-script.yaml

@@ -1,3 +1,30 @@
+{{- $existingSecret := lookup "v1" "Secret" .Release.Namespace (printf "%s-credentials" .Release.Name) }}
+{{- $passwords := dict }}
+
+{{- with (index $existingSecret "data") }}
+  {{- range $k, $v := . }}
+    {{- $_ := set $passwords $k (b64dec $v) }}
+  {{- end }}
+{{- end }}
+
+{{- range $user, $u := .Values.users }}
+  {{- if $u.password }}
+    {{- $_ := set $passwords $user $u.password }}
+  {{- else if not (index $passwords $user) }}
+    {{- $_ := set $passwords $user (randAlphaNum 16) }}
+  {{- end }}
+{{- end }}
+
+{{- if .Values.users }}
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ .Release.Name }}-credentials
+stringData:
+  {{- range $user, $u := .Values.users }}
+  {{ quote $user }}: {{ quote (index $passwords $user) }}
+  {{- end }}
+{{- end }}
 ---
 apiVersion: v1
 kind: Secret
@@ -13,7 +40,7 @@ stringData:
     {{- range $user, $u := .Values.users }}
     SELECT 'CREATE ROLE {{ $user }} LOGIN INHERIT;'
     WHERE NOT EXISTS (SELECT FROM pg_catalog.pg_roles WHERE rolname = '{{ $user }}')\gexec
-    ALTER ROLE {{ $user }} WITH PASSWORD '{{ $u.password }}' LOGIN INHERIT {{ ternary "REPLICATION" "NOREPLICATION" (default false $u.replication) }};
+    ALTER ROLE {{ $user }} WITH PASSWORD '{{ index $passwords $user }}' LOGIN INHERIT {{ ternary "REPLICATION" "NOREPLICATION" (default false $u.replication) }};
     COMMENT ON ROLE {{ $user }} IS 'user managed by helm';
     {{- end }}
     EOT