fix: skip dir when loop Helm templates

[nodece]

Signed-off-by: Zixuan Liu nodeces@gmail.com

Which issue this PR fixes

fixes #7359

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[rawlingsj]

/ok-to-test

[MarckK]

/lgtm

[MarckK]

Thank you @nodece!

[rawlingsj]

/lgtm

[jenkins-x-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MarckK, rawlingsj

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