[StepSecurity] Apply security best practices

[sozercan]

Hey folks,

This is originally generated by https://app.stepsecurity.io/securerepo and I updated with a few changes
sozercan#1

What this PR does:

• Adds dependabot with a weekly cadence with grouping for GHA and k8s deps to bump various dependencies like gomod, docker etc, to make lives of maintainers easier
• introduces codeql, openssf scorecard and dependency review to improve supply chain security
• pins existing GHA to improve security. these dependencies will still automatically get bumped by dependabot
• adds harden runner with an audit policy. this will surface network endpoints used by the CI. and in the future, you can change this to deny to enable network isolation for improved security
• sets least amount of permissions to existing workflows
• adds optional pre-commit hooks to shift left to prevent any cred leaks, linting, etc
• pins golang builder image to a digest. this will still automatically get bumped by dependabot
• remove baseimage docker var, since the image won't be able to get bumped automatically with that

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sozercan
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[k8s-ci-robot]

Hi @sozercan. Thanks for your PR.

I'm waiting for a kubernetes 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.

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[hakman]

/ok-to-test