Update chart to use webhook resources from values file

[anders-elastisys]

I want to install Triggermesh using the Helm chart in a Kubernetes cluster that have OPA rules that enforce resource requests on all containers. The values.yaml file contains variables for setting this, but this is not used anywhere. An easy fix is to add it to the webhook/deployment.yaml file:

      containers:
        - name: webhook
          ...
          resources:
            {{- toYaml .Values.webhook.resources | nindent 12 }}