use readOnlyRootFilesystem

[bradwhitfield]

Issue #, if available:

aws-controllers-k8s/community#2166

Description of changes:

Configure the generated helm chart to set a readOnlyRootFilesystem on pods for ACK controllers to improve the security posture.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

Hi @bradwhitfield. Thanks for your PR.

I'm waiting for a aws-controllers-k8s member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[a-hilaly]

/ok-to-test

[ack-prow]

@bradwhitfield: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
verify-attribution	e1633dc	link	false	/test verify-attribution

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[a-hilaly]

/test ec2-controller-test

[bradwhitfield]

Is the verify-attribution something I can fix? I'm not sure what the check is.

[a-hilaly]

Thank you @bradwhitfield !!
/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-hilaly, bradwhitfield

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[a-hilaly]

@bradwhitfield the verify-attribution is a new prow job that is not mandatory for now :)