feat: generic extra manifests for unleash chart (#124)

* feat: generic extra manifests for unleash chart

This allows including resources like credentials for the database
connection or the secret env vars for unleash (e.g. shared secret,
google client secret, ...) from a 3rd-party secrets provider and then
referencing those secrets in the "existing secrets"

charts/unleash/Chart.yaml

@@ -15,4 +15,4 @@ sources:
   - https://github.com/Unleash/unleash
   - https://github.com/Unleash/helm-charts
 type: application
-version: 3.1.0
+version: 3.1.1

charts/unleash/templates/extra-manifests.yaml

@@ -0,0 +1,8 @@
+{{ range .Values.extraObjects }}
+---
+{{- if typeIs "string" . }}
+    {{- tpl . $ }}
+{{- else }}
+    {{- tpl (toYaml .) $ }}
+{{- end }}
+{{ end }}

charts/unleash/values.yaml

@@ -263,6 +263,17 @@ autoscaling:
   targetCPUUtilizationPercentage: 70
   targetMemoryUtilizationPercentage: 70
 
+extraObjects: []
+# - apiVersion: mumoshu.github.io/v1alpha1
+#   kind: AWSSecret
+#   metadata:
+#     name: unleash-secret
+#   spec:
+#     stringDataFrom:
+#       secretsManagerSecretRef:
+#         secretId: unleash-secret-production
+#         versionId: 00000000-1111-2222-3333-444444444444
+
 # CloudSQL in GKE
 cloudsql:
   # If you enable cloudsql, ensure that serviceAccount.annotations is populated with associated GKE workload identity: