Adds configurable init containers for both Guacamole client and guacd deployments, enabling pre-start tasks like waiting for dependencies or initializing shared storage.

Created with the help of Copilot.
Fixes #2

Changes

• values.yaml: Added initContainers array under both client and guacd sections
• client-deployment.yaml / guacd-deployment.yaml: Render init containers when configured
• README.md: Added documentation and usage examples

Usage

client:
  initContainers:
    - name: wait-for-database
      image: busybox:1.36
      command: ['sh', '-c', 'until nc -z postgres 5432; do sleep 2; done']

guacd:
  initContainers:
    - name: init-recordings
      image: busybox:1.36
      command: ['sh', '-c', 'mkdir -p /recordings']
      volumeMounts:
        - name: recordings
          mountPath: /recordings