Add ability to specify dnsPolicy in sidecar injector helm chart

[whytem]

Description

When enabling hostNetwork: true in the sidecar injector chart to resolve networking issues associated with using CNI on EKS, which results in the Kubernetes Control Plane being unable to access the sidecar injector webhook, it is often also necessary to set the pod's dnsPolicy to 'ClusterFirstWithHostNet' to prevent DNS issues.

The sidecar injector Helm Chart currently offers no ability to specify the dnsPolicy and hence it always reverts to the cluster default.

This straightforward PR adds the option to provide this value to the sidecar injector chart. If no value is explicitly specified, it continues using the cluster default per the existing behavior.

Issue reference

#4270

Checklist

[yaron2]

Thanks for this contribution. Can you please add this option to the table here? https://github.com/dapr/dapr/tree/master/charts/dapr

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.31%. Comparing base (9f5a423) to head (6bfae86).
Report is 115 commits behind head on master.

❗ Current head 6bfae86 differs from pull request most recent head ab758ff. Consider uploading reports for the commit ab758ff to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7407      +/-   ##
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+ Coverage   62.26%   62.31%   +0.04%     
==========================================
  Files         245      240       -5     
  Lines       22380    22058     -322     
==========================================
- Hits        13935    13745     -190     
+ Misses       7289     7172     -117     
+ Partials     1156     1141      -15     

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[whytem]

Sure. I've added an explanation of the new configuration option in the readme. Thanks

[daixiang0]

@whytem please fix DCO.

[whytem]

@daixiang0 Fixed! Thank you

[dapr-bot]

This pull request has been automatically marked as stale because it has not had activity in the last 60 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!