athens-proxy-charts/examples/configmap.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: custom-configs
data:
  sshconfig: |
    Host github.com
      IdentityFile /root/.ssh/id_ed25519
      StrictHostKeyChecking no    
  gitconfig: |
    [url "git@github.com:"]
      insteadOf = https://github.com/