CUSTESC-71: Implement extraManifests (#3)

This seems to be a common practice in the Helm community, as documented here: open-telemetry/opentelemetry-helm-charts#1361

In our case, it can help inject a secret or configmap along with the Helm chart, e.g. for injecting the kubeconfig of a Kubernetes resource as a volume.

Author: ramnes

charts/connector/templates/extra-manifests.yaml

@@ -0,0 +1,4 @@
+{{- range .Values.extraManifests }}
+---
+{{ toYaml . }}
+{{- end }}

charts/connector/values.yaml

@@ -62,3 +62,12 @@ volumes: []
 volumeMounts: []
 serviceAccount:
   name: ""
+
+# Extra manifests to deploy as an array of objects
+extraManifests: []
+  # - apiVersion: v1
+  #   kind: ConfigMap
+  #   metadata:
+  #     name: example-configmap
+  #   data:
+  #     key: value