add helm chart

[xavier-hou]

Signed-off-by: hxcGit houxc_mail@163.com

usage

helm install raven-agent charts/raven-agent --set vpn.psk=`openssl rand -hex 64`  -n kube-system

Raven-agent requires a unique vpn psk, we can generate one with the command: 'openssl rand -hex 64'. And pass it to helm by '--set vpn.psk=`openssl rand -hex 64`'. Currently, we set psk to "OPENYURT-RAVEN-AGENT-VPN-PSK" in values.yaml. Users should replace it manually.

[codecov[bot]]

Codecov Report

Merging #78 (822bd8e) into main (f69371b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #78   +/-   ##
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  Coverage   45.59%   45.59%           
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  Files           7        7           
  Lines         805      805           
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  Hits          367      367           
  Misses        386      386           
  Partials       52       52           

Flag	Coverage Δ
unittests	45.59% <ø> (ø)

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[njucjc]

LGTM