Adding entrypoint

[JoshuaCooper]

Removing busybox and adding entrypoint. This makes helm as your entrypoint so the image can run with an input of a helm chart.

➜  kargo git:(main) ✗ docker run kargo:latest-amd64    
The Kubernetes package manager

Common actions for Helm:

- helm search:    search for charts
- helm pull:      download a chart to your local directory to view
- helm install:   upload the chart to Kubernetes
- helm list:      list releases of charts

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[hiddeco]

Can you elaborate on why this would be an improvement? As I have a hard time reasoning why someone would want to use the Kargo image to run helm.

[krancour]

This PR makes no sense at all.